292 ROBINSON: PTERIDOPHYTA OF THE HAWAIIAN ISLANDS 
dition; Maui, Batley C; Hillebrand B; Robinson 385 V; Oahu, 
Gaudichaud B; Lichtenthaler N; Kauai, Bishop BM; Forbes 444 
BM; Heller 2749 C, N; Hawaiian Islands, Baldwin 65 C, N. 
Dryopteris paleacea is closely allied to the widely distributed 
Dryopteris Filix-mas, but the crowded pinnae, the truncate form 
of the pinnules, the form and number of the scales of the rachis 
distinguish it from the more lax and open form of the latter. 
Dryopteris fusco-atra (Hilleb.) comb. nov. 
Aspidium Filix-mas var. fusco-atrum Hilleb. Fl. Haw. Is. 575. 
1888 
TYPE LOCALITY: Hawaiian Islands. 
DisTRIBUTION: At high elevations, Hawaiian Islands. 
ILLUSTRATION: PLATE 42. 
SPECIMENS EXAMINED: Maui, Hillebrand 24 B; Oahu, Forbes 
BM; Kauai, Bishop B; Heller 2589 C, N; 2746 C; Hillebrand 
C; Hawaiian Islands, Baldwin B; Hillebrand 24 B; Mann ©& 
Brigham 255 N; Miss Sessions C. 
The lax character of the leaves and the dark color of the scales 
are excellent field marks by which to distinguish this fern from 
Dryopteris paleacea. 
DryYoPTERIS NUDA Underw. in Heller, Minn. Bot. Stud. 1: 780. 
1896 
Aspidium glabrum Hilleb. Fl. Haw. Is. 576. 1888. (Not Mett.) 
TYPE LOCALITY: Kauai. 
DIsTRIBUTION: Hawaiian Islands. 
ILLUSTRATION: PLATE 43. 
SPECIMENS EXAMINED: Hawaii, Robinson 251 V; Maui, Bishop 
B; Hillebrand B; Robinson 335 V; 339 V; 393 V; Oahu, Baldwin 
B; Hillebrand B; Robinson 1908 V; Kauai Heller 2750 (type) ©; 
Hillebrand B; Robinson 818 V. 
This fern strongly resembles Dryopteris spinulosa but is a much 
more compact, rigid form and has more acute ultimate divisions. 
DRYOPTERIS GLABRA (Brack.) Kuntze, Rev. Gen. PI. 2: 812. 1891 
Lastraea glabra Brack. Fil. U. S. Expl. Exp. 200. 1854. 
Aspidium glabrum Mett. Aspid. 59. 1858. 
Aspidium glabrum var. quadripinnatum Hilleb. Fl. Haw. Is. 576: 
1888. 
