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Fronds with slender, usually crowded stipes up to 200 mm long. Pinnae narrowly obdeltate with slightly convex flanks, up to 10 x 8 mm in floating fronds, smaller in terrestrial forms. Sporocarp: pedicels solitary, free, slender; obliquely broad-oblong or irregularly rhombic in lateral view, narrowly elliptic in dorsiventral view, lateral ribs absent, raphe distinct, inferior tooth absent, or very rarely present as a small hump, superior tooth distinct, short, conical, acute or subacute, rarely obtuse, erect or recurved.
Aquatic perennial. Fronds with slender, usually crowded, glabrous stipes, 70-200 mm long; pinnae narrowly obdeltoid to obdeltate-obovate, distal margins crenate to undulate, glabrous to thinly pilose. Sporocarps obliquely broad-oblong or irregularly rhombic in lateral view, narrowly elliptic in dorsiventral cross-section, laterally compressed or only slightly inflated, thinly pilose, inferior tooth usually absent, superior tooth distinct, short, conical, acute, straight or recurved, lateral ribs absent.
Seasonal, aquatic perennial. Fronds with slender, usually crowded stipes, pinnae narrowly obdeltate, flanks slightly concave, pedicels solitary, free, slender. Sporocarps obliquely broad-oblong or irregularly rhombic in lateral view, lateral ribs absent, superior tooth distinct, conical, erect or recurved.
Aquatic perennial. Fronds with slender, usually crowded stipes, pinnae narrowly obdeltate, flanks slightly convex, pedicels solitary, free, slender. Sporocarps obliquely broad-oblong or irregularly rhombic in lateral view, lateral ribs absent, superior tooth distinct, conical, erect or recurved.
Stipes slender, usually crowded, ± 70-200 mm long. Raphe distinct, covering four-fifths to entire sporocarp base. Sporocarps elliptic in dorsiventral cross-section, dark brown to almost black at maturity.
