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Published In: Tekhno-Botanicheskīĭ Slovar': na latinskom i rossīĭskom iazykakh. Sanktpeterburgie 438. 1820. (27 Mar 1820) (Tekhno-Bot. Slovar.) Name publication detail

Project Name Data (Last Modified On 9/21/2011)
Acceptance : Accepted

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Low, perennial ferns, mostly terrestrial. Rhizome short, usually vertical, not scaly. Leaves solitary or few, petiolate, not circinnate in bud. Sporophyll reduced to 1 or rarely more, simple or branched stalks, with spikes of 2-rowed sporangia. Sporangia sessile, with walls of several cell layers, without annuli, opening by a slit. Spores numerous, all alike, typically globular-tetrahedral. Prothallium monoecious, usually subterranean, more or less tuberous, usually without chlorophyll but with endotrophic mycorrhiza.

     Comprises 3 genera: 2 cosmopolitan, 1 in Tropical Asia and Australasia.


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