Isoetes montezumae A.A.Eaton
Descripción
Rootstock bilobed; leaves ca. 20, ca. 30 cm long, pale toward bases, triangular in mid-length transection; velum covering less than 25% of each sporangium; sporangial walls usually brownspotted; megaspores white, average 400–550 µm in diam., smooth or obscurely to boldly tuberculate-verrucate with girdle smooth; microspores light gray in mass, average 35–45 µm long, echinatetuberculate.A
Ejemplar revisado
Ags (McVaugh 818, ENCB, MICH). Chis (Breedlove 15070, DS, ENCB, F, LL, MEXU, MICH, NY, WIS). DF (Rzedowski 34261, ENCB). Jal (Pringle 4003, GH, L, MO, NY, VT). Méx (Pringle 3459, BM, E, F, G, GH, JE, M, MEXU, MO, NY, PH, US, VT). Mich (Gonzalez 280, ENCB, MEXU, NY). Mor (Pringle 6660, BM, E, F, G, JE, LL, MO, NY, PH, UC, US, VT). Nay (McVaugh 18672, CAS, NY). Qro (Rzedowski 51180, IEB). Zac (Rzedowski & McVaugh 984, ENCB, IEB, MEXU, MICH, NY).
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Elevación
2000 – 3500 mA
Ecología y Hábitat
Ponds, streams, grassy meadows, roadside ditches in seasonally wet, August–November.A
Tipo de vegetación
(oak-pine woodlands). Bosque de otro tipoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Isoëtes montezumae and I. mexicana appear to be closely related species that could be treated as a one variable species. Differences in spore size and ornamentation, in addition to what appear to be interspecific hybrids, support recognizing them as genetically divergent species until additional evidence proves otherwise. See discussion under I. mexicana.
Most collections of I. montezumae can be identified by their larger spores, tuberculate megaspores, and sporangial walls that are spotted or streaked with patches of brownish cells. In contrast, I. mexicana has smaller spores and more often shiny, smooth, porcelain-like megaspores that are contained within unspotted sporangial walls.
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Most collections of I. montezumae can be identified by their larger spores, tuberculate megaspores, and sporangial walls that are spotted or streaked with patches of brownish cells. In contrast, I. mexicana has smaller spores and more often shiny, smooth, porcelain-like megaspores that are contained within unspotted sporangial walls.
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