Abstract
Stem protostelic, the stele anchor-shaped or cylindrical, not indurated, bearing many, long, firm, usually dichotomously branched roots; leaves borne in a close spiral or distichous, more or less acicular, with 1 vein; sporangia very large, single, sessile, thin-walled, and more or less embedded near the base of the leaf on the adaxial side; heterosporous, spores without chlorophyll. Megagametophytes and microgametophytes minute, partly protruding from the megaspore or microspore wall.
Isoetaceae Reichenb., Bot. Damen Kunst. Freunde Pflanzenw. 309. 1828. Type: Isoetes L.
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Tryon, R.M., Tryon, A.F. (1982). Isoetaceae. In: Ferns and Allied Plants. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8162-4_30
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