2S. ASPIDIUM. § 2. SAGENIA. 241 



/3'.S'. Texture generally chartacems to coriaceous. 



§. Surfaces pubescent. Texture moderately firm. 



(37) A. melanorachis. 

 §.§. Surfaces naked. Texture + coriaceous except in No. 40. 



*. Lowest pinnae simple. Sori dense, superficial. 



(38) A. persoriferum. 

 >({.*. Lowest, pinnae forked, lobed or pinnatifid. Sori superficial. 



X. Fronds under 50 c.M. long. Sori in close rows, 



often confluent, on connected veins. (39) A. siifoliuin. 



X.x. Fully developed fronds often more than 50 c.M. 



long. Sori not in close rows, on free, veinlets. 



Texture herbaceous to chartaceous. 



(40) A. pachyphyllum. 

 ;^c.)^'..:^c. Lowest pinnae pinnate. Sori copious, immersed. 



(41) A. brachiatum. 



(11) A. [Everettii, C. Chr., Ind. Pil.; Nephrodium EveretltIL Bk., 



Kew Bull., d896, 41. , 



Stipes slender, IS — 20 c.M. long, naked, castaneous. Fronds deltoid, 

 20 — 2S c.M. each way, cut down nearly to the costa. Lobes 2 on each side^ 

 lanceolate or oblong-lanceolate, acuminate, entire, the lowest largest, 2*/^ — K 

 c.M. broad. Texture membranaceous; both surfaces naked; primary veins 

 arcuate, reaching the margin; at-eolae small, copious, with free veinlets. Sori 

 copious, scattered, small, superficial; indusium membranaceous, persistent. 



Natuna Islands. 



» 



* (12) A. vastuiii, Bl., Christ, Parnkr. d. Erde, 230; ^4. alatum, 

 Wall., Hk. & Grev., Ic. Pil., tab. CLXXXIV; Sagenia vasta, Moore, Rac, Plor. 

 Btz., I, 196; S. alata, Bedd., Perns. Br.I., II, tab. CLXIX; Tectaria vasta, Copel., 

 Philipp. Journ., II, 411. 



Rhizome creeping or erect, clothed with rigid, brown, lanceolate, subentire 

 scales. Stipes scattered or approximate, narrowly winged often nearly or 

 quite to the base, 30—60 c.M. long. Pronds ovate, 30—120 c.M. long, 

 15 — 60 C.M. broad, cut down to a broadly winged rachis into entire, distant, 

 linear-oblong segments 7—30 c.M. long, 2 — 5 c.M. broad, acute or acuminate, 

 about 4 — 6 on a side. Texture papyraceo-herbaceous or subcoriaceous ; 

 main veins distinct, reaching to ±. % of the way or nearly to the edge. 



