71 POLYPODIUM. § 6. PLEOPEIiTrS. b*. LEPISORUS. 638 



naked; veins immersed; midrib distinct. Fertile fronds linear, B— 13 c.M. 

 long, ± 5 m.M. broad, on stipes 2*/j — 8 c.M. long, with a lobe under each 

 sorus. Sori + 20 in a row on each side of the midrib, large, giving the 

 frond a knotted appearance. 



♦ (146) P- istenopteris, me., Joum. of Bot., XVII, 43 ; Christ, Ann. 

 Btz., XX, tab. Ill, fig. 4. 



Rhizome wide-creeping; scales dense, squarrose, brown, the base round- 

 ish, peltate, the point long, fine, linear. Stipes nearly none or to 4 c.M. 

 long, the fertile fronds on the longest stipes. Fronds dimorphous. Barren 

 fronds lanceolate-spathulate, 3 — 5 c.M. long, '/a — 1 c.M. broad, the apex blunt- 

 ly rounded, the edge entire, thickened, the base gradually narrowed, + cu- 

 neate. Texture very rigidly coriaceous; costa conspicuous; veins hidden. Fer- 

 tile fronds 20 — 30 c.M. long, the lower half narrowly lanceolate, the edge 

 entire, the base cuneately narrowed, the apex narrowed gradually into the 

 narrow, linear, repand upper half of the frond. Sori immersed, rather dis- 

 tant, confined to the linear upper half of the frond, placed in the projections 

 of the waves, 1 to each lobe, prominent on the upper surface. 



Borneo. 



• (147) P. jsoridenis, Jifc., Hk. Bk., Syn. Fil., 35S; Hk., Spec. Fil., 

 V, tab. CCLXXXIII, B. 



Rhizome wide-creeping; scales squarrose, the base roundish, peltate, the 

 apex long, fine, linear. Stipes 2'/2 — 7'/j c.M. long, slender, naked, scattered. 

 Fronds linear-lanceolate, 10 — 30 c.M. long, '/j — I'/a '^•^- broad, narrowed very 

 gradually to both ends, the barren ones with the edge entire or repand; fer- 

 tile fronds toothed with the teeth distant and rounded, or deeply and very 

 irregularly incised with the lobes spreading, oblong, bluntly rounded, 1 — 50 

 m.M. apart, the sinuses broadly rounded. Te-^ture rigid, coriaceous; sur- 

 faces naked; no main veins; areolae fine; free veinlets rare. Sori submar- 

 ginal, terminal on the lobes, 1 to each tooth or lobe, deeply immersed, form- 

 ing very distinct papillae on the upper surface.. 



Borneo. 



* (148) P. neglectum, bl, Flor. Jav., II, 133, tab. LIV, fig. 1. 

 Rhizome moderately long, creeping, dirty-brown; scales dense, small, lan- 

 ceolate-subulate, recurved, the younger ones reddish-bro:wn, [eroso-ciliate, villo- 



