ROBINSON: PTERIDOPHYTA OF THE HAWAIIAN IsLANDs 209 
ASPLENIUM UNILATERALE Lam. Encyc. 2: 305. 1786 
Asplenium resectum J. E. Sm. Pl. Ic. Ined. 3. pl. 72. 1790-91. 
Asplenium amoenum Presl, Tent. Pterid. 107. 1836. 
Asplenium emargino-dentatum Zenker; Kunze, Linnaea 24: 263. 
1851. 
TYPE LOCALITY: Mauritius. 
DIsTRIBUTION: In wet, shady localities, Mauritius, Japan, 
China, Polynesia, Hawaiian Islands. 
SPECIMENS EXAMINED: Hawaii, Robinson 622 V; Wilkes Expe- 
dition N; Maui, Bailey C; Lichtenthaler N; Heller 2844 C, N; 
Robinson 359 V; 366 V; 380 V; Oahu, Arnott N; Beechey C; Mann 
& Brigham 168 N; Robinson 72 V; 120 V; 122 V; 184 V; Safford 
918 N; Kaala Mts., Wilkes Expedition N; Kauai, Forbes 439 BM; 
Hawaiian Is., Baldwin 37 C, N; Miss Sessions C; Wilkes Expedition 
€, N; ex Herb. John Donnell Smith N. 
ASPLENIUM RHOMBOIDEUM Brack. Fil. U.S. Expl. Exp. 156. 1854 
Asplenium stoloniferum Presl, Rel. Haenk.1:44. 1825. Not Bory. 
Asplenium fragile Presl, Hilleb. Fl. Haw. Is. 589. 1888. 
TYPE LOCALITY: Hawaiian Islands. 
DIsTRIBUTION: At elevations of 400-700 m., Hawaii and Maui. 
ILLUSTRATIONS: Brack. Fil. U. S. Expl. Exp. pl. 27. f. 2. 
1854; Presl, Rel. Haenk. 1: pl. 6.f.4. 1825. 
SPECIMENS EXAMINED: Hawaii, Mauna Kea, Wilkes Expedition 
N; Forest near Cape Lua Pele, Wilkes Expedition N; Maui, Hille- 
brand N; Hawaiian Is., Baldwin B, C, N; ex Herb. John Donnell 
Smith N. 
A. rhomboideum is closely related to the South American A. 
fragile and to A. viride of N. Europe and Canada. It differs from 
both in the openness of the fronds and flabellate form of the pinnae 
as well as in size. 
Kunze (Klotzsch, Linnaea 13: 140. 1839) in describing A. 
fragile collected by Ehrenberg in Peru gives the length of the 
largest fronds as 2 in. He describes the habit as the same as 
that of A. viride and makes A. castaneum Schlect. (Linnaea §: 
611. 1830) and A. projectum Kunze (Linnaea 9: 68. 1834) 
synonyms. Diels, in E. & P. Nat. Pfl. 14: 235. 1899, gives A. 
fragile as a doubtful species, while he gives A. castaneum and A. 
