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Hygrophoropsis

Hygrophoropsis is a genus of gilled fungi in the family Hygrophoropsidaceae. It was circumscribed in 1888 to contain the type species, H. aurantiaca, a widespread fungus that, based on its appearance, has been affiliated with Cantharellus, Clitocybe, and Paxillus. Modern molecular phylogenetic analysis shows that the genus belongs to the suborder Coniophorineae of the order Boletales.

Hygrophoropsis
Hygrophoropsis aurantiaca
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Boletales
Family: Hygrophoropsidaceae
Genus: Hygrophoropsis
(J.Schröt.) Maire ex Martin-Sans (1929)
Type species
Hygrophoropsis aurantiaca
(Wulfen) Maire (1921)
Diversity
16 species
Synonyms[1]
  • Cantharellus subgen. Hygrophoropsis J.Schröt. (1888)

There are 16 accepted species of Hygrophoropsis, found in both the Northern and Southern Hemispheres. Hygrophoropsis is a saprophytic genus that causes brown rot in the wood it colonises. The fruit bodies grow on the ground in woodlands, on moss, peat, and on woodchips. They are convex to infundibuliform (funnel-shaped) and have decurrent, forked brightly colored gills. The spores are dextrinoid, meaning that they stain reddish-brown in Melzer's reagent. Because H. aurantiaca has orange gills, it has been mistaken for a chanterelle, and hence it has been called a false chanterelle.

Taxonomy

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Hygrophoropsis was originally circumscribed in 1888 by German mycologist Joseph Schröter as a subgenus of Cantharellus. It contained a single species, the widespread H. aurantiaca,[2] commonly known as the false chanterelle. German naturalist Bernhard Studer-Steinhäuslin concluded in 1900 that the fungus was more appropriately placed in the genus Clitocybe, based on its white spores, decurrent gills, and lack of a ring on the stipe.[3] This classification was adopted in the early writings of influential mycologist Rolf Singer, who in 1943 proposed that Hygrophoropsis should be a subgenus of Clitocybe.[4]

French naturalist Emile Martin-Sans elevated Hygrophoropsis to the status of genus in his 1929 publication L'Empoisonnement par les champignons et particulièrement les intoxications dues aux Agaricacées du groupe des Clitocybe et du groupe des Cortinarius, while attributing authorship to his countryman René Maire. According to Martin-Sans, he concurred with Maire's assessment of Hygrophoropsis, suggesting that it represented a form intermediate between Cantharellus and Clitocybe, and was thus worthy of generic rank.[5] The name Hygrophoropsis refers to a likeness (Greek: ὄψις, opsis) to the genus Hygrophorus.[6]

Boletales
Cladogram showing phylogenetic relationships of Hygrophoropsis with major clades of the Boletales.[7]

Hygrophoropsis aurantiaca has been confused with the true chanterelles (genus Cantharellus) because of overall similarities in appearance. A combination of characters—including forked gills, frequently off-centre stipe placement, and dextrinoid spores—suggested to others a relationship with Paxillus.[8] These characteristics prompted Singer to classify the genus Hygrophoropsis in the Paxillaceae in 1946,[9] although others placed it in the Tricholomataceae,[10] a family that has been described as a wastebasket taxon.[11] Singer initially included only two species, both with dextrinoid spores—H. aurantiaca and H. tapinia.[12] He justified the placement of Hygrophoropsis in the Paxillaceae largely on fruit body morphology and spore size: "The discovery of a second species, H. tapinia, with smaller spores and an external appearance frankly suggesting Paxillus curtisii but never met with in Clitocybe, makes the affinity between Hygrophoropsis and Paxillus an established fact."[9] In 1975, he added H. olida, a species with inamyloid but cyanophilous spores, whose characteristics otherwise aligned with the type species.[13]

Hygrophoropsis is now the type genus of the family Hygrophoropsidaceae, circumscribed by Robert Kühner in 1980 to contain it and the genus Omphalotus.[14] Singer considered this family to be "transient between Tricholomatales and Boletales".[12] Molecular phylogenetic analysis confirmed its affinity lay in the order Boletales in 1997,[15] though later research showed that it is not closely related to Paxillus or other gilled boletes. Instead, it is most closely related to the genus Leucogyrophana. Hygrophoropsis and Leucogyrophana are sister to Coniophora, near the base of the cladogram representing the Boletales.[7]

The presence of several pigments in the type species, including variegatic acid, variegatorubin, and several other derivatives of pulvinic acid,[16] suggests a chemotaxic relationship with the Boletaceae, Coniophoraceae, and Paxillaceae—families of Boletales with members that have similar compounds.[17][18]

Description

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Closeup of the orange, forked gills of H. aurantiaca

Hygrophoropsis species have fruit bodies with concave caps that often have wavy margins and rolled-in edges. The texture of the cap surface ranges from somewhat tomentose to velvety. Typical fruit body colors are orange, brownish-yellow (fulvous) or paler, buff, and cream. The gills have a decurrent attachment to the stipe. They are narrow with blunt edges, often multiply forked, and readily detachable from the stipe.[19] The flesh is soft and generally the same colour as the fruit body surface, or lighter. The taste and odour of the flesh is usually nondescript, or similar to cultivated mushrooms.[19] In contrast, H. rufa can have a distinct ozone-like smell, reportedly reminiscent of the orchid Oncidium ornithorhynchum or a photocopier.[20]

The spore print colour ranges from whitish to cream. Microscopically, Hygrophoropsis lacks cystidia and has spores that are dextrinoid, meaning that they stain reddish-brown in Melzer's reagent. Clamp connections are present in the hyphae.[19] With respect to overall appearance, Hygrophoropsis species closely resemble those in genus Cantharellula; the latter genus, however, has amyloid rather than dextrinoid spores.[17]

Habitat, distribution, and ecology

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Collectively, Hygrophoropsis is a widespread genus, found in both Northern and Southern Hemispheres.[19] Hygrophoropsis aurantiaca is the most widely distributed species, found on several continents.[21] The other species are not well-known and have more limited ranges.[20] Fruit bodies grow on the ground in woodlands, on moss, and peat, and on woodchips.[19] Hygrophoropsis is a saprophytic genus, and causes brown rot in the wood it colonises.[19] Some species may be facultatively mycorrhizal.[12]

Hygrophoropsis aurantiaca secretes large amounts of oxalic acid—a reducing agent and relatively strong acid—into the soil around its woody substrate.[22] This chemical stimulates weathering of the humus layer of forest soil, as the organic matter in soil breaks down into smaller molecules.[23] This influences the solubility and turnover of nutrients (particularly phosphorus and nitrogen), which in turn affects their availability for use by forest trees.[22]

Species

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A 2008 estimate in the Dictionary of the Fungi placed five species in the genus.[24] As of November 2015, Index Fungorum accepts 16 species in Hygrophoropsis:[25]

Name The binomial name of the Hygrophoropsis species.
Authority The author citation—the person who first described the species using an available scientific name, eventually combined with the one who placed it in Hygrophoropsis, and using standardized abbreviations.
Year The year in which the species was named, or transferred to the genus Hygrophoropsis.
Distribution The distribution of the species.


Image Name Authority  Year Distribution
  H. aurantiaca (Wulfen) Maire 1921 Widespread[21]
H. bicolor Hongo 1963 Japan[26]
H. coacta McNabb 1969 New Zealand[27]
H. flabelliformis (Berk. & Ravenel) Corner 1966 United States[28]
H. fuscosquamula P.D.Orton 1960 Great Britain[29]
H. kivuensis Heinem. 1963 Republic of Congo[30]
H. laevis Heinem. & Rammeloo 1985 Malawi[31]
  H. macrospora (D.A.Reid) Kuyper 1996 Great Britain[32]
H. mangenotii Locq. 1954 Ivory Coast[33]
H. ochraceolutea Contu & Bon 1991 Sardinia[34]
H. panamensis Singer 1983 Central America[35]
H. psammophila (Cleland) Grgur. 1997 Australia[36]
H. purpurascens (Berk. & M.A.Curtis) Dennis 1952
  • South America
  • Oceania[37]
  H. rufa (D.A.Reid) Knudsen 2008
H. rufescens (Quél.) Singer 1986 Europe[40]
H. tapinia Singer 1946

Hygrophorus pallidus, recorded by Charles Horton Peck in 1902, is considered by mycologist Thomas Kuyper to be not validly published and "better regarded as a nomen confusum",[32] a taxonomic opinion corroborated by Geoffrey Kibby.[20] Now considered the type species for the genus Aphroditeola, A. olida was formerly classified in Hygrophoropsis, but it lacks dextrinoid basidiospores, and phylogenetically it is classified in the Agaricales.[42] Other species formerly placed in Hygrophoropsis but since transferred to other genera include: H. stevensonii (Berk. & Broome) Corner 1966 (now Gerronema stevensonii);[43] H. albida (Fr.) Maire 1933 (now Gerronema albidum);[44] H. umbonata (J.F.Gmel.) Kühner & Romagn. 1953 (now Cantharellula umbonata);[45] and H. umbriceps (Cooke) McNabb 1969 (now Cantharellus umbriceps).[46]

References

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  1. ^ "Synonymy: Hygrophoropsis (J. Schröt.) Maire ex Martin-Sans". Species Fungorum. CAB International. Retrieved 11 November 2015.
  2. ^ Schröter J. (1888). Cohn F (ed.). Kryptogamen-Flora von Schlesien (in German). Vol. 3–1(4). Breslau, Germany: J. U. Kern (Max Müller). p. 511.
  3. ^ Studer B. (1900). "Cantharellus aurantiacus Wulf". Hedwigia (in German). 39: 6–7.
  4. ^ Singer R. (1943). "Das System der Agaricales. III". Annales Mycologici (in German). 1–3: 1–189 (see p. 22).
  5. ^ Martin-Sans E. (1929). L'Empoisonnement par les champignons et particulièrement les intoxications dues aux Agaricacées du groupe des Clitocybe et du groupe des Cortinarius (in French). Lyon: Société Linnéenne de Lyon. pp. 99, 225. OCLC 633752563.
  6. ^ David JC. (2003). "Orthographic conundrums: the problem of -opsis and -botrys" (PDF). Taxon. 52 (3): 603–608. doi:10.2307/3647463. JSTOR 3647463.
  7. ^ a b Binder M, Hibbett DS (2006). "Molecular systematics and biological diversification of Boletales". Mycologia. 98 (6): 971–81. doi:10.3852/mycologia.98.6.971. PMID 17486973.
  8. ^ Arora D. (1986). Mushrooms Demystified: A Comprehensive Guide to the Fleshy Fungi. Berkeley, California: Ten Speed Press. pp. 479–80. ISBN 978-0-89815-169-5.
  9. ^ a b c Singer R. (1946). "The Boletineae of Florida with notes on extralimital species . IV. The lamellate families (Gomphidiaceae, Paxillaceae, and Jugasporaceae)" (PDF). Farlowia. 2: 527–67 (see pp. 544–47).
  10. ^ Miller OK Jr, Farr DF (1975). An Index of the Common Fungi of North America, Synonymy and Common Names. Bibliotheca Mycologica. Vol. 44. Vaduz: Cramer. ISBN 978-3768209748.
  11. ^ Vellinga EC. (2008). "A mycological florilegium of the phylogenetic literature: Looks deceive" (PDF). Fungi. 1 (1): 21–23.[permanent dead link‍]
  12. ^ a b c Singer R. (1981). "Notes on bolete taxonomy—III". Persoonia. 11 (3): 269–302 (see p. 286).
  13. ^ Singer R. (1975). The Agaricales in Modern Taxonomy (3rd ed.). Vaduz, Germany: Cramer. ISBN 978-3768201438.
  14. ^ Kühner R. (1980). "Les Hyménomycètes Agaricoides: Agaricales, Tricholomatales, Pluteales, Russulales". Bulletin Mensuel de la Société Linnéenne de Lyon (in French). 49: 900.
  15. ^ Binder M, Besl H, Bresinsky A (1997). "Agaricales oder Boletales? Molekularbiologische Befunde zur Zuordnung einiger umstrittener Taxa" (PDF). Zeitschrift für Mykologie (in German). 63 (2): 189–96. Archived from the original (PDF) on 2015-11-17. Retrieved 2015-11-15.
  16. ^ Besl H, Bresinsky A, Kopanski L, Steglich W (1978). "Pilzpigmente, XXXV. 3-O-Methylvariegatsäure und verwandte Pulvinsäurederivate aus Kulturen von Hygrophoropsis aurantiaca (Boletales)" [Pigments of Fungi, XXXV. 3-0-Methylvariegatic acid and related pulvinic acid derivatives from cultures of Hygrophoropsis aurantiaca (Boletales)]. Zeitschrift für Naturforschung C (in German). 33 (11–12): 820–25. doi:10.1515/znc-1978-11-1203. S2CID 87401294.  
  17. ^ a b Kuyper TH. (1995). "Genus Hygrophoropsis". In Bas C, Kuyper TW, Noordeloos ME, Vellinga EC (eds.). Flora Agaricina Neerlandica. Vol. 3. Boca Raton, USA: CRC Press. p. 64. ISBN 978-90-5410-616-6.
  18. ^ Nelson SF. (2010). "Bluing components and other pigments of boletes" (PDF). Fungi. 3 (4): 11–14.
  19. ^ a b c d e f Watling R. (2008). A Manual and Source Book on the Boletes and their Allies. Synopsis Fungorum. Vol. 24. Oslo, Norway: Fungiflora. pp. 71–72. ISBN 978-8290724363.
  20. ^ a b c Kibby G. (2012). "The Hygrophoropsis aurantiaca complex". Field Mycology. 13 (2): 43–50. doi:10.1016/j.fldmyc.2012.03.004.
  21. ^ a b Roberts P, Evans S (2011). The Book of Fungi. Chicago, Illinois: University of Chicago Press. p. 164. ISBN 978-0-226-72117-0.
  22. ^ a b Fransson A-M, Valeur I, Wallander H (2004). "The wood-decaying fungus Hygrophoropsis aurantiaca increases P availability in acid forest humus soil, while N addition hampers this effect". Soil Biology and Biochemistry. 36 (11): 1699–1705. Bibcode:2004SBiBi..36.1699F. doi:10.1016/j.soilbio.2004.04.027.
  23. ^ Dutton MV, Evans CS (1996). "Oxalate production by fungi: its role in pathogenicity and ecology in the soil environment". Canadian Journal of Microbiology. 42 (9): 881–895. doi:10.1139/m96-114.
  24. ^ Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CAB International. p. 326. ISBN 978-0-85199-826-8.
  25. ^ Kirk PM. "Species Fungorum (version 27th October 2015). In: Species 2000 & ITIS Catalogue of Life". Archived from the original on 2020-10-08. Retrieved 2015-11-10.
  26. ^ Hongo T. (1963). "Notulae mycologicae". Memoirs of the Faculty of Liberal Arts and Education, Shiga University. 13: 53–57.
  27. ^ McNabb RFR. (1969). "The Paxillaceae of New Zealand". New Zealand Journal of Botany. 7 (4): 349–362. Bibcode:1969NZJB....7..349M. doi:10.1080/0028825X.1969.10428850.  
  28. ^ Corner EJH. (1966). A Monograph of Cantharelloid Fungi. Oxford and New York: Oxford University Press. p. 134.
  29. ^ Orton PD. (1960). "New check list of British Agarics and Boleti, part III (keys to Crepidotus, Deconica, Flocculina, Hygrophorus, Naucoria, Pluteus and Volvaria)". Transactions of the British Mycological Society. 43 (2): 159–439 (see p. 245). doi:10.1016/s0007-1536(60)80065-4.
  30. ^ Heinemann P. (1963). "Champignons récoltés au Congo par Madame M. Goossens-Fontana: IV. Hygrophoropsis". Bulletin du Jardin Botanique de l'État à Bruxelles. 33 (2): 413–415. doi:10.2307/3667206. JSTOR 3667206.
  31. ^ Heinemann P, Rammeloo J (1985). "Hymenagarici novi". Bulletin du Jardin Botanique National de Belgique. 55 (3–4): 494–495. doi:10.2307/3667970. JSTOR 3667970.
  32. ^ a b Kuyper TW. (1996). "Notulae ad Floram agaricinam neerlandicam XXIV-XXVIII. Some taxonomic and nomenclatural changes in the Tricholomataceae, tribus Clitocybeae". Persoonia. 16 (2): 225–232 (see p. 231).
  33. ^ Locquin M. (1954). "Une chanterelle comestible de la Côte d'Ivoire: Hygrophoropsis Mangenotii sp. nov". Journal d'Agriculture Tropicale et de Botanique Appliquée (in French). 1 (7): 359–361. doi:10.3406/jatba.1954.2168.
  34. ^ Contu M, Bon M (1991). "Champignons de Sardaigne (trois nouvelles espèces)". Documents Mycologiques (in French). 21 (81): 41–45.
  35. ^ Singer R, Araujo I, Ivory HM (1983). "The Ectotrophically Mycorrhizal Fungi of the Neotropical Lowlands, Especially Central Amazonia". Beihefte zur Nova Hedwigia. 77: 28.
  36. ^ Grgurinovic CA. (1997). Larger Fungi of South Australia. Adelaide: State Herbarium of South Australia. p. 201. ISBN 978-0-7308-0737-7.
  37. ^ Dennis RWG. (1952). "Lepiota and allied genera in Trinidad, British West Indies". Kew Bulletin. 7 (4): 459–500 (see p. 491). Bibcode:1952KewBu...7..459D. doi:10.2307/4117800. JSTOR 4117800.
  38. ^ Knudsen H, Vesterhold J (2008). Funga Nordica. Copenhagen: Nordsvamp. p. 913. ISBN 978-8798396130.
  39. ^ Holec J, Kolařík M (2013). "Notes on the identity of Hygrophoropsis rufa (Basidiomycota, Boletales)" (PDF). Czech Mycology. 65 (1): 15–24. doi:10.33585/cmy.65102.
  40. ^ Singer R. (1986). Agaricales in Modern Taxonomy. Vaduz, Germany: Koeltz. p. 726. ISBN 978-3-87429-254-2.
  41. ^ Gómez-Pignataro LD. (1992). "Los Basidiomicetes de Costa Rica: V. Paxillaceae (Agaricales, Boletineae)" [Basidiomycetes from Costa Rica: V. Paxillaceae (Agaricales, Boletineae)]. Brenesia (in Spanish). 38: 105–13.
  42. ^ Redhead SA. (2013). "Nomenclatural novelties" (PDF). Index Fungorum. 15: 1–2.
  43. ^ "Hygrophoropsis stevensonii (Berk. & Broome) Corner". Index Fungorum. CAB International. Retrieved 2015-11-16.
  44. ^ "Hygrophoropsis albida (Fr.) Maire". Index Fungorum. CAB International. Retrieved 2015-11-16.
  45. ^ "Hygrophoropsis umbonata (J.F. Gmel.) Kühner & Romagn". Index Fungorum. CAB International. Retrieved 2015-11-16.
  46. ^ "Hygrophoropsis umbriceps (Cooke) McNabb". Index Fungorum. CAB International. Retrieved 2015-11-16.
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