646 71. POLYPODIUM. § 6. PLEOPBLTIS. b**- PLEDRIDIUM. 



Rhizome wide-creeping, the scales dense, linear, squarrose, dull-brown. 

 Stipes distant, 7 — 15 c.M. long, firm, erect. Fronds 15 — W c.M. long, 3 '/j — 5 

 c.M. broad, the point acute or acuminate, the edge repand, the base rounded 

 or rather narrowed and auricled. Textiu-e coriaceous; surfaces naked; main 

 veins very distinct to the edge; areolae fine, hidden, vdth copious free vein- 

 lets. Sori large, in 1 row on each side near the midrib, solitary between 

 the main veins. 



\ar. borneense: Sori more distant from the midrib, smaller, 

 more numerous; rhizome scales linear-lanceolate, pale-brown. 



South. China, North. India; — var. horneense: Borneo. 



(171) P. l¥hitfordi, Copeh, Philipp. Journ., I, Suppl., 256, tab. 

 IV, B. 



Rhizome creeping, the scales lanceolate, apiculate, persistent, pale-ferrugi- 

 neous when young. Stipes distant, filiform, 1— 47i c.M. long, the fertile 

 fronds on the longest stipes. Fronds dimorphous. Barren fronds 1 — S'/j 

 cJM. long, the smallest ones orbicular, the largest oblong, obtuse, the margin 

 cartilagineous, broadly and shallowly crenate. Texture coriaceous; surfaces 

 naked; costa black beneath; main veins straight, reaching nearly to the mar- 

 gin; areolae quadrangular, in ± 5 — 4 rows on each side, with few included, 

 excurrent free veinlets. Fertile fronds 20 — 60 c.M. long, 6 — 9 m.M. broad, 

 the smallest ones entii'e, obtuse, the largest crenate, acute, cuneate at the 

 base. Sori in 1 row on each side, medial between the costa and margin, sub- 

 immersed, prominent on the upper surface, not restricted to the highest part 

 of the frond. 



Luzon. 



• (172a) P. Trenbii, Cht-ist., Ann. Btz., XX, 121; P. dolichosorum, 

 Christ, MS. in Herb. Bog. 



Rhizome wide-creeping, slender; scales firm, the base roundish, peltate, 

 the point long, fine, hair-like, spreading, reddish-brown. Stipes slender, firm, 

 5 — 9 c.M. long, naked. Fronds subdimorpbous. Barren fironds lanceolate-ovate, 

 B— 7 c.M. long, + I'/j — 2 c.M. broad, the apex subacute, the margin entire, 

 the base cuneate. Texture ± coriaceous; surfaces naked; main veins fine but 

 visible, slightly prominent, oblique; areolae hidden, with free veinlets. Fertile 

 fronds on the longest stipes, narrowly lanceolate, longer and narrower than 

 the barren ones, to 11 c.M. long, to 1 c.M. broad; main veins hidden. Sori 

 in 1 row on each side, to + 20 to a row, oblong, medial between the mid- 



