Marattiaceae

Senterre, Bruno, Rouhan, Germinal, Fabre, Isabelle, Morel, Charles & Christenhusz, Maarten J. M., 2014, Revision of the fern family Marattiaceae in the Seychelles with two new species and a discussion of the African Ptisana fraxinea complex., Phytotaxa 158 (1), pp. 57-75 : 62

Key to Marattiaceae on the Seychelles

1. False veins (venuloids) absent, pinnae mostly (sub-)opposite, sporangia completely fused into a two-lipped synangium ... ........................................................................................................................................................... Ptisana laboudalloniana

-. False veins present between true veins, pinnae mostly alternate, sporangia not completely fused into a synangium, fused only at base ............................................................................................................................................................................ 2

2. Secondary rachises distinctly winged; terminal pinnules up to 25 cm, much longer than ultimate pairs of distal pinnules (6–10 cm); petioles with conspicuous wart-like bases of old scales ........................................... Angiopteris chongsengiana

-. Secondary rachises not winged; terminal pinnules similar in size to other pinnules (ca 20 cm); petioles with wart-like bases of old scales, but these small and inconspicuous .................................................................... Angiopteris madagascariensis