﻿S22 57. ADIANTUM. § 1. EU-ADIANTUM C. POLYSORIAE. 



;ic. Rhizome scales bristle-like. Lobes of the leaflets ovate 



or transversally oblong. (7) A. Zollingeri. 



;fc.;K. 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. 



c. Fronds unbranched, often proliferous at the apex. 

 f. Pinnae [leaflets) rather deeply lobed. 



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



g.ff. 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. 



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



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



>|^-. Leaflets dimidiate, trapezi form. (11) A. trapeziforme. 



if..i(:. Leaflets unequal-sided, rather obliquely ovate. 



(12) A. peruvianum. 

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



«.«. Fronds 3 — ^-pinnate at least at the base (^). 



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

 f . Rhizome wide-creeping ; leaflets bluntish at the apex. 



(14) A. pulchellum. 

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



(15a) A. aculeolatum. 

 (156) A. mindanaoense. 

 l.±. Rachises naked, but often scabrous. 



2. Leaflets small, i — 2 c.M. long, 3 — 5 m.M.broad. (16) A. formosum. 

 3.2. Leaflets larger, 2 — 3 c M. long, + iO m.M. broad. 



(17) A. polyphyllum. 



(4) A. goiiipliopliylluiii, Sle., Ann. of Bot, VIII, 124. 



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

 5 — 10 c.M. long, 2 — S'/j 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- dfaphanum, Bt., var. affine & A., acnleolatuin, v. A. v. R. 

 (') See also A. peruvianum, Kl. & trapeziforme, X. 



