574 ROBINSON: PTERIDOPHYTA OF THE HAWAIIAN ISLANDS 
Pieris pentaphylla Willd. Sp. Pl. 5: 362. 1810. 
Pieris triphylla Mart. & Gal. Mém. Acad. Brux. 1S: 51. pl. 14. f. 7. 
1824, 
Pieris scabripes Wall. Cat. no. 94. 1828. 
Pteris melanocaulon Fée, Mém. Foug. 7: Sl. Bh.-19. fo Le TBE 
Pteris Treacheriana Baker, Jour. Bot. 17: 65. 1879. 
Pteris lomarioides Colenso, Trans. N. Z. Inst. 13: 380. 1881. 
TYPE LOCALITY: Crete. 
DISTRIBUTION: On ground and on trees, tropical countries. 
ILLUSTRATIONS: Mart. & Gal. Mém. Acad. Brux. 15: 51. Pl. 
14.f.I. 1824; Fée, Mém. Foug.%: 31. pl. 10: f.2.. 1957 
SPECIMENS EXAMINED: Maui, Bailey C; Bishop B; Hillebrand 
B; Oahu, Heller 2782 C: Hillebrand B; Robinson 22 V; 25 V; 42 
V; Kauai, Knudsen 39 B; Hawaiian Islands, Baldwin 19 B, C. 
PTERIS IRREGULARIS Kaulf. Enum. 189. 1842 
Pteris alata Gaud. Voy. Freyc. Bot. 391. 1829. 
Pteris regularis E. Bailey, Haw. Ferns 26. 1883. 
TYPE LocALITy: Hawaiian Islands. 
DISTRIBUTION: In woods and shady gulches 300-900 m. eleva- 
tion; Hawaiian Islands. 
ILLusTRATION: Gaud. Voy. Freyc. Bot. pl. 79. 1829. 
SPECIMENS EXAMINED: Hawaii, Hillebrand B, K; Maui, Batley 
C; Hillebrand B; Wilkes Expedition C; Oahu, Bennett 85 B; 
Chamisso C; Forbes BM; Gaudichaud B; Heller 2335 C; Hille- 
brand B; 79 B; Lindley K; Macrae B; Mann & Brigham 162 C; 
Meyen B; Nuttall K; Robinson 12 V; 56 V; 61 V; 65 V; 116 V; 
Kauai, Knudsen 40 B; 41 B; 60 B; Hawaiian Islands, Baldwin 17 
B, C; Douglas 31 K; Gaudichaud 184 B; Hillebrand K; Knudsen 
29 B; 42 B; Miss Sessions C; Wilkes Expedition C. 
Bailey (Haw. Ferns 25. 1883) believed that two species had 
been confused under the name P. irregularis and sought to clear up 
the difficulty by describing P. regularis. The variations shown by 
leaves growing upon the same plant permit placing the several 
forms in one species. 
3- PTERIDIUM Gleditsch, in Scop. Fl. Carn. 169. 1760 
Rootstock wide-creeping; leaves distant, not articulate, trl- 
angular to deltoid-ovate, ternately compound; sorus linear, follow- _ 
