48 POLYPODIACE.E OF THE PHILIPPINE ISLANDS. 



under surface, and still more the rachis, ferruginous-pubescent; sori near 

 the margin; indusium becoming orbicular. 



Cagayan-Luzon, Warburg 12221; Benguet, Elmer 623.5, G469; Topping 

 211; Sorsogon, Baranda; Manila, Santos, Ramos; Tayabas, Merrill 24.38; 

 Mindoro, Merrill 884; Davao, Copeland 389, 485, 589, the most char- 

 acteristic plant of the edges of drier thickets. 



(7) N. barbata Copeland. Rhizome short, suberect, with many fine 

 supporting roots; stipes 10 to 15 cm. high, firm, sparsely scaly at the 

 base, glabrescent above; frond rather more than 50 cm. long, 8 cm. broad; 

 pinnae, the larger sterile ones 35 mm. long, 10 mm. broad, acute, entire, the 

 fertile 50 mm. long, 7 mm. broad, acuminate, more or less serrate toward 

 the apex, rounded on the lower side at the base, acutely auriculate on the 

 upper, subarcuate, subcoriaceous, glabrous, reduced toward the base of 

 the frond ; sori near the margin ; indusivun orbicular, the lobes overlapping. 



Todaya, Davao, epiphytic on tree trunks, Copeland 1286. 



(13) CLEAN DRA Cavanilles. 



Rhizome creeping or erect, branching, scaly; stipes articulate to projec- 

 tions from the rhizome; fronds simple and entire, lanceolate; veins free, 

 running to the margin of the frond, sori on the backs of the veins, near the 

 costa; indusiiun reniform, fixed by the sinus, firm. This genus was 

 formerly classed with the Aspidieo', and has lately been separated as 

 constituting an isolated group. It seems to me, however, that the resem- 

 blances to A'arious Davalliece, and specially to the simple species of 

 Humata — the creeping, scaly rhizome, the articulate stipe, the free, 

 forked, closely parallel veins, the shape, attachment, and texture of the 

 indusium, and its opening obliquely toward the apex of the frond — all 

 these can not well be construed otherwise than as evidences of real 

 affinity; and that, while the position of the sori may well serve as a 

 generic character, it ought not to make us adopt a larger classification 

 that fails to express so many characters in common. 



1. Rhizome woody, suberect. 



2. Stipe articulate just below lamina (1) 0. coluirina 



2. Stipe articulate "below its middle" (2) O. neriiformis 



1. Rhizome creeping. 



2. Palese squarrose (3) O. Whitmeei 



2. Palese appressed — (4) O. Cumingii 



(1) O. colubrina (Blanco) Copeland. Rhizome woody, stout, suberect, 

 branching, clothed with scales whose very narrow spreading tips are decid- 

 uous, leaving the persistent, imbricate, peltate bases, black with brown 

 margins; stipe articulate immediately below the lamina; fronds mostly 

 clustered, 15 to 20 cm. long, about 2 cm. broad, widening toward the 

 upper end, then abruptly contracted and caudate, narrowed gradually 

 toward the base, entire, the margin sometimes slightly cartilaginous under 

 the lens, ciliate with whitish hairs, with which the surfaces are sparsely 

 and the costa densely clothed, papyraceous; sori in an irregular row on 

 each side of costa ; indusia small, brown with white margins, firm, almost 

 without a sinus. 



Mount Mariveles, Merrill 3238, Copeland 1381, Whitford 248. 



