Main rachis 7 mm or more diameter; primary branches twice equally forked, copious dark red rigid hairs very persistent near the forks; ultimate branches 30-55 cm long, 5-7 cm wide, the lowest outer segments of the lamina sometimes enlarged and more or less lobed; accessory branches at penultimate forks 16-18 cm long, 5 cm wide; stipular leaflets at base of primary branches 3 cm long, lobes 3 mm wide; costules of ultimate branches 5-6 mm apart; lamina-segments 3½ mm wide above the base, thin but firm; veins usually 3 times forked, first fork very close to the costule, very slightly prominent on both surfaces; stout dark red multicellular hairs (1-1½ mm long, with several basal branches) at first abundant all along lower surface of costae, at length deciduous leaving costae perceptibly rough; thinner and paler, dull rusty-brown, hairs at first abundant on costules, slightly crisped and with short unicellular branches near base only; sori of 10-15 sporangia, often two on a vein-group (on each of the outer-most branches); spores monolete, c. 32 x 16 μ.
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