Q48 ROBINSON: PTERIDOPHYTA OF THE HAWAIIAN ISLANDS 
ILLUSTRATION: Hook. Sp. Fil. 1: pl. 37. 1844. 
SPECIMENS EXAMINED: Hawaii, Robinson 209 V; 215 V; Maui, 
Bailey C; Robinson 311 V; 317 V; 326 V; Oahu, Diell C; Heller 
2603 C; 2620 C; Hillebrand C; Macrae B; Robinson 39 V; 508 V; 
Forbes BM; Kauai, Forbes 113 BM; Hillebrand 152 B; Robinson 
835 V; Hawaiian Islands, Baldwin 102 C; Beechey C; Gaudichaud 
195 B; Lindley C; Wilkes Expedition 15 B, C. 
Hymenophyllum recurvum is a very graceful fern, which forms 
a light green covering upon the tree trunks and wet rocks in deep, 
shady glens. 
HyMENOPHYLLUM optusuUM Hook. & Arn. Bot. Beech. 109. 1832 
TYPE LOCALITY: Oahu. 
DIsTRIBUTION: On trees, in wet forests, Hawaiian Islands; 
also reported from New Guinea and Cape of Good Hope. 
ILLUSTRATION: Hook. Sp. Fil. 1: pl. 37D. 1844. 
SPECIMENS EXAMINED: Molokai, Hillebrand B; Oahu, Heller 
2229 C; 2910 C; Robinson 10 V; 37 V; 503 V; Hawaiian Islands, 
Baldwin 104 C; Wilkes Expedition C. 
HYMENOPHYLLUM LANCEOLATUM Gaud. Voy. Freyc. Bot. 109 
1832 
TYPE LOCALITY: Hawaiian Islands. 
DIsTRIBUTION: On tree trunks in Hawaiian Islands. 
ILLUSTRATION: Hook. Sp. Fil. pl. 34. 1844. 
SPECIMENS EXAMINED: Hawaii, Robinson 273 V; 278 Vv; M 
Bailey C; Oahu, Heller 2256 C; 2705 C; Macrae B; Robinson 7° 
V; 04 V; 96 V; 125 V; Kauai, Robinson 404 V; 406 V; 830 Vi 
Hawaiian Islands, Baldwin 103 C; Douglas B; Gaudichaud Bi 
Wilkes Expedition B; C. 
The fronds soon become bronze in color, partly from a 
hairiness of their surface, by which, as well as by their size, they 
are easily distinguished from H. recurvum. 
The following specimens are smaller than the others and beat 
only marginal hairs: Heller 2705, Robinson 302, 404, 406, 83 
aui, 
