Pronephrium rhombeum

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Pronephrium rhombeum


Asia-Tropical: Philippines (Philippines present); Sulawesi (Sulawesi present), Luzon present, Mindanao present, N. Borneo present
Malesia: Philippines (Luzon to Mindanao), N. Borneo, Celebes.


The Kew isotypes of the lectotypes cited do not differ in the ways indicated in Copeland's keys and descriptions of 1960, and among many specimens seen I cannot see two distinct forms. The Kew specimen of Copeland 250 has pinnae more dilated distally than that of Cuming 149, though Copeland indicates the contrary. The pinnae with irregular large distal lobes figured (as line drawings) with the pho- tograph of the type of D. rhombea by Copeland (1935) are representative of a group of forms, almost always with 4-5 pairs of pinnae, which appear to be hybrids and are here treated as P. x xiphioides.


Copel. 1960: Fern Fl. Philip.: 357
Copel. 1960: Fern Fl. Philip.: 353