Diorygma archeri is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae.[1] Found in Vietnam, it was formally described as a new species in 2013 by Santosh Joshi and Jae-Seoun Hur. The type specimen was collected from Yok Đôn National Park (Đắk Lắk province) at an altitude of about 760 m (2,490 ft). The species epithet honours Australian lichenologist Alan W. Archer.[2]

Diorygma archeri
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Graphidales
Family: Graphidaceae
Genus: Diorygma
Species:
D. archeri
Binomial name
Diorygma archeri
S.Joshi & Hur (2013)

Description

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Diorygma archeri has a flat thallus that is usually white or grayish-green in color and up to 800 μm thick. The outer layer of the lichen (the pseudocortex) is distinct, reaching up to 30 μm. The algal layer is well-developed and about 50–60 μm thick. The inner layer, the medulla, is white and thick, with crystals scattered throughout it.[2]

The fruiting bodies of the lichen, called ascomata, are numerous and can vary in shape, with some being short and curved while others are more branched. They are covered by a brownish or reddish-brown layer that is surrounded by a raised, irregular margin. The hymenium, which is the part of the ascomata that contains the spores, is hyaline and can be seen to be violet-blue when treated with certain chemicals. The spores themselves are oval to elliptic in shape, multicellular, and range in size from 150 to 255 x 53 to 85 μm.[2]

Diorygma archeri contains protocetraric acid, a lichen product that can be detected using thin-layer chromatography.[2]

Diorygma archeri is comparable to Diorygma pruinosum, but the two differ in several ways. Specifically, D. archeri has a thick, distinctly corticate body that is grayish-green in color and contains a well-developed medulla. The apothecial disc of D. archeri is only slightly open, and its proper exciple is not carbonized. Additionally, Diorygma archeri has larger ascospores than D. pruinosum.[2]

References

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  1. ^ "Diorygma archeri S. Joshi & Hur". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 15 March 2022.
  2. ^ a b c d e Joshi, Santosh; Jayalal, Udeni; Oh, Soon-Ok; Koh, Young Jin; Nguyen, Thi Thuy; Dzung, Nguyen Anh; Hur, Jae-Seoun (2013). "New species and new records in the family Graphidaceae (Ascomycota: Ostropales) from Vietnam". The Lichenologist. 45 (5): 599–609. doi:10.1017/s002428291300025x.