Isoetes riparia, the shore quillwort,[4] is a species of plant in the family Isoetaceae.[2] It can be found in rivers, creeks, and tidal mud flats in southern Quebec and southeastern Ontario, south to eastern New York.[5] It has 5 to 35 long, erect bright green to yellow-green leaves, which are 6 to 35 centimeters long. The velum covers one fourth of the sporangium, which can be 7 millimeters long and 4 millimeters wide. The elongated ligule can grow to be 3 millimeters long. The spherical megaspores are 430 to 680 micrometers in diameter with closely set ridges. The kidney-shaped microspores are 24-35 micrometers long, and usually have spine-tipped tubercules. The megaspores can sometimes come to resemble that of either I. echinospora, if the megaspores become eroded and bear projections that could resemble spines, or I. macrospora, if the broken ridges take a certain shape.[5]
| Isoetes riparia | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Lycophytes |
| Class: | Lycopodiopsida |
| Order: | Isoetales |
| Family: | Isoetaceae |
| Genus: | Isoetes |
| Species: | I. riparia
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| Binomial name | |
| Isoetes riparia | |
| Synonyms | |
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References
edit- ^ Smith, K. (2016). "Isoetes riparia". IUCN Red List of Threatened Species. 2016: e.T64315225A67729796. doi:10.2305/IUCN.UK.2016-1.RLTS.T64315225A67729796.en. Retrieved 19 November 2021.
- ^ a b "Isoetes riparia Engelm. ex A.Braun". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved September 26, 2020.
- ^ "Isoetes riparia Engelm. ex A. Braun". World Flora Online. The World Flora Online Consortium. n.d. Retrieved September 26, 2020.
- ^ USDA, NRCS (n.d.). "Isoetes ripara". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 26 May 2015.
- ^ a b Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.
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