﻿16. ARTHUOPTERIS. 155 



^. Surfaces + hairy. Indusium fugacious. (1) A. obliterata. 



;|<.)|<. Surfaces naked. Indusium persistent. (2) A. glabra. 



* (1) A. obliterata, J. Sm., G. Chr., Ind. Fil.; A. ramosa. Melt. 

 (not J. Sm.), Copel., Polypod. Philipp., 46 ; Nephrolcpis ramosa, Moore, Rac, 

 Flor. Btz., I, 201; N. obliterala, J. Sm., Journ. of Bot., IV, 197; Bedd., Ferns 

 S.I., tab. CCLI ; Nephrodium obliteratum, R. Br., (oldest name). 



Rhizome wide-creeping, slender, branched, scaly. Stipes scattered, short, 

 ± 2 c.M. long. Fronds 15—45 c.M. long, ^%—8 c.M. broad, gradually but 

 slightly narrowed towards both ends; rachis slightly flexuose. Pinnae ± 

 12 — 20 on each side, + sessile, 1—2 c.M. broad, obliquely rhomboidal, the 

 apex bluntish or subacute, sometimes rounded, the edges entire or more 

 or less distinctly crenate especially in the fertile pinnae, the upper base truncate 

 and auricled, the lower base obliquely narrowed. Texture thin or more or 

 less coriaceous; rachis and both surfaces hairy, sometimes scaly. Sori 1 to 

 each crenation, at a distance of 1 — 2 m.M. from the edge; indusium roundish 

 or subcordate, fugacious. 



Paleotropical. 



(2) A. glabra, CopeL, Polypod. Philipp., 46. 



Rhizome wiry, climbing ± 5 M. high, sparsely clothed with black, ad- 

 pressed scales. Stipes + 5 m.M. long, articulate 1 — 2 m.M. beyond the 

 base. Fronds 20 — 30 c.M. long, 5 — 7 c.M. broad, pinnate, with a terminal 

 pinna rather larger than the others. Lateral pinnae ± 8 m.M. broad, obtuse 

 or the higher ones subacute, obscurely crenate, slightly auricled, the upper 

 base abruptly truncate, the lower very oblique. Texture papyraceous; sur- 

 faces naked; remaining green when dried. Sori roundish, + medial, nearer 

 the margin than the costa ; indusium fixed by a very naiTOw sinus, persistent. 



Philippines. 



\^. ]VEE»13:R0LEE»1S, ScUon. 



Sori eithei' round or reniform, submarginal or medial, in 1 row on each side 

 of the costa, terminal on the anterior veinlets of the once forked veins or 

 transversally oblong to linear, marginal, uniting the apices of 2 or more veins. 



