o22 37. ADIANTUM. § 1. EU-ADIAWTUM C. POLTSORIAE. 



i^. Rhizome scales bristle-like. Lobes of the leaflets ovate 



or transversally oblong. (7) A. Zollingeri. 



i^.-^. Rhizome scales lanceolate. Lobes of the leaflets oblong or 



linear-oblong. (8) A. caudatum. 



C.C. Surfaces naked or nearly so. 



d. Rachis not winged. 



e. Fronds unbranched, often proliferous at the apex. 

 f. Pinnae (leaflets) rather deeply lobed. 



g. Rachis naked. (9a) A. rhizophorum. 



g.g. Rachis rather long-hairy. (96) A. ciliatum. 



f.f. Pinnae (leaflets) entire or rather shallowly lobed. 

 f. Fronds i—2\ c.M. broad. 



(10a) A. Spencerianum. 



•{•.•{•. Fronds 3 — 8 c.M. broad. (106) A. lunulatum. 



e.e. Fronds mostly branched, not proliferous at the apex (*). 



if:. Leaflets dimidiate, trapesiform. (1 1) A. trapeziforme. 



i(i.%. Leaflets unequal-sided, rather obliquely ovate. 



(12) A. peruvianum. 

 d.d. Rachis winged. (13) A. Mettenii. 



tt-a. Fronds 3 — 4-pinnale at least at the base (^). 



1. Rachises pubescent or tomentose at least on the upper side. 

 -{•. Rhizome wide-creeping; leaflets bluntish at the apex. 



(14) A. pulchellum. 

 +.+. Rhizome short-creeping; leaflets bluntly rounded at the apex. 



(l5o) A. acoleolatum. 

 ^56) A. mindanaoense. 

 ±.±. Rachises naked, but often scabrous. 



2. Leaflets small, jf-Z c.M. long, 3 — Om.M. broad. (16) A. formosum. 

 S.3. Leaflets larger, 2 — 3 c M. long, ± iO m.M. broad. 



(17) A. polyphyllum. 



(4) A. gomithopbyllum, Alc, Ann. of Bot., VIII, 124. 



Stipes tufted, erect, straight, black-brown, nearly naked. Fronds ligulate, 

 B — 10 c.M. long, 2 — Vj^ c.M. broad, simply pinnate. Leaflets 5 — 6-jugate, 

 7 — 10 m M. each way, short-stalked, deltoid, the sides entire, straight, the 



(') See also A. dlaphanam, Bl., var. afline & A. acaleolatain, v. A. v. R. 

 (*) See also A. peroTlannni, El. & trapeziforme, L. 



