Isoetes pringlei Underw.
Descripción
Rootstock bilobed; leaves ca. 15, ca. 25 cm long, pale toward bases, half-terete at mid-length transection; velum covering less than 25% of each sporangium; sporangial walls unspotted; megaspores white, average 475–650 µm in diam., echinate-cristate with girdle granulate; microspores light gray in mass, average 35–45 µm long, smooth.A
Ejemplar revisado
Chis (Breedlove 20424, DS, MEXU). Jal (Pringle 3333, BM, E, G, GH, JE, M, MO, MICH, MU, NY, PH, UC, US, VT). Méx (Arreguín 711, IEB, XAL; Pringle 13261, C, GH, L, MO, UC, US, VT, s.n., 11 August 1897, NY).
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Distribución
México (país) EndémicoA
Elevación
2800 – 3000 mA
Ecología y Hábitat
Temporary pools and saturated soil in seasonally wet savanna, August–November.A
Tipo de vegetación
SabanaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Isoëtes pringlei is the only Mexican species with echinatecristate megaspores. Megaspore ornamentation is easily observed with a 10X hand lens.A