72. CYCLOPHORUS. § 1. NIPHOBOLUS. 679 



c. The stellate hairs of the under surface scattered. 



+. Main veins hidden. Sori in 5 — 6 rows between the midrib 

 and margin. (g) C. aiietioides. 



+.+. Main veins distinct. Sori in iO — 20 rows between the mid- 

 rib and margin. (6) C. sphaerostichus. 

 c.c. The stellate hairs of the under surface crowded or interlaced, but 



d. Main veins hidden. 



•f. Fronds contracted in the fertile region. Sori immersed 



in the tomentum. (7) C. macropodus. 



•{•.•$•. Fronds hardly contracted in the fertile region. Sori not 



immersed in the tomentum. (8) C. acrostichoides. 



d.d. Main veins distinct. 



e. Fronds small, under 30 c.M. long. 



f. Rhizome scales ad/pressed, obscurely peltate at the 



base, rather sessile. (9) C. pannosus. 



f.f. Rhizome scales spreading, distinctly peltate at the 



base. (10) C. heteractis. 



e.e. Fronds larger, 60 — 90 c.M. long. (11) C. princeps. 



a.a.. Tomentum loose, woolly, thick. 



±. Fronds small, under 6 c.M. long. (*) 



X. Barren fronds suborbicular, cordate or rounded at the base, on stipes 



i — 2 m.M. long. (12) C. nummularifolius. 



x.X' Barren fronds obovate, cuneate at the base, on stipes ± iO m.M. 



long. (13) C. obovatus. 



±.±. Fronds larger, more than 6 c.M. long when fully developed. 



3. Texture thin or weak. 



+. Fronds linear, ± */j c.M. broad. (14) C. lanuginosus. 



+ .+. Frondsnanceolate, 2—8 c.M. broad. (15) C. penangianus. 

 9.S. Texture thick, firm. 



3. Fronds mostly 8—30 c.M. long. 



S.. Fronds narrow, to ± 5 m.M. broad. Sori in i — 3 rows 

 on each^side of the casta. (16) C. rasamalae. 



4:.M:. Fully developed fronds + i c.M. broad, or broader. 

 S. Sori in 2 — 4 rows on each side of the costa. 



f. Upper surface without depressed dots and mi- 

 nute blackish scales. (17) C. flocciger. 



(*) See also under C. rasamalae, C, Chr. 



