Isoetes macrospora, the big-spore quillwort,[1] is a species of quillwort in the Isoetaceae family. It can be found in the deep water of low nutrient lakes in the Precambrian Shield as well as in Newfoundland, Nova Scotia, Quebec, and Ontario. In the United States, it has been found in Minnesota and south, through the Appalachian Mountains to Virginia.[2] It bears 3 to 17 long, stiff dark green leaves, sometimes with recurving tips. The sporangium can be 5 millimeters long and 4 millimeters wide, covered from one sixth to one quarter by the velum. The triangular ligule can grow up to 2 millimeters long. The spherical, white megaspores are 400 to 800 micrometers in diameter, and bear ridges that form honeycomb-like areas. The kidney-shaped microspores are 32 to 50 micrometers long, each with evenly spaced smooth papillae.[2]
^USDA, NRCS (n.d.). "Isoetes macrospora". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 26 May 2015.
^ abCody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.
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isoetes, macrospora, spore, quillwort, species, quillwort, isoetaceae, family, found, deep, water, nutrient, lakes, precambrian, shield, well, newfoundland, nova, scotia, quebec, ontario, united, states, been, found, minnesota, south, through, appalachian, mou. Isoetes macrospora the big spore quillwort 1 is a species of quillwort in the Isoetaceae family It can be found in the deep water of low nutrient lakes in the Precambrian Shield as well as in Newfoundland Nova Scotia Quebec and Ontario In the United States it has been found in Minnesota and south through the Appalachian Mountains to Virginia 2 It bears 3 to 17 long stiff dark green leaves sometimes with recurving tips The sporangium can be 5 millimeters long and 4 millimeters wide covered from one sixth to one quarter by the velum The triangular ligule can grow up to 2 millimeters long The spherical white megaspores are 400 to 800 micrometers in diameter and bear ridges that form honeycomb like areas The kidney shaped microspores are 32 to 50 micrometers long each with evenly spaced smooth papillae 2 Isoetes macrospora Scientific classification Kingdom Plantae Clade Tracheophytes Clade Lycophytes Class Lycopodiopsida Order Isoetales Family Isoetaceae Genus Isoetes Species I macrospora Binomial name Isoetes macrosporaDur Synonyms Isoetes heterospora A A Eat References edit USDA NRCS n d Isoetes macrospora 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 nbsp This lycophyte related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Isoetes macrospora amp oldid 1160263069, wikipedia, wiki, book, books, library,
