Rhizomorph trilobed, less than 15 mm in diameter; rhizomorph-scales horny, nitid, blackish brown, deltate, often elongate-cuspidate. Sporophylls up to 40 in number, erect to lax, up to 110-400 (-600) mm long, abruptly narrowed from an orbicular base, up to 14 mm broad, bases often persistent, horny; apex gradually tapered to a fine point; ligule deltate. Sporangium lacking velum, oblong-obovate, orbicular, 7-12 x 6-8 mm. Megaspores with prominent discrete rounded tubercles on distal face, proximal faces almost smooth or with a group of few or many tubercles, 375-560 µm. Microspores alate.
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