37. ADIANTUM. § 1. EO-ADIANTUM. C. POLVSORIAE. 329 



lower of which are branched again below a long terminal branch. Se- 

 iary branches + 8 c.M. long or longer. Leaflets dimidiate, rhomboidal 

 lost a parallelogram), sessile, numerous, close, 2—3 c.M. long, + 1 c.M. 

 id, the upper and lower sides parallel, the apex bluntly rounded, the upper 



outer edge crenate, or lobed and. serrate. Texture firm-membranaceous 

 subcoriaceous ; rachises and surfaces naked; veins terminating in the ulti- 

 e serratures. Sori numerous, placed in shallow hollows at the apices of 



lobes or crenations, 1 to each lobe, along the upper and sometimes also 



outer edge; capsules springing from the veins only. 



Much cultivated. — Orig. loc: Venezuela, Peru. 



% 1. EU-ADIANTUM. d. Cuneatae. 



Ultimate segments (leaflets) articulate at the base; ultimate petioles distinctly 

 nodose at the apex. (18) A. tenerum. 



, Ultimate segments [leaflets) not articulate at the base; ultimate petioles not 

 nodose at the apex. ^ ^^ ^ 



h. Leaflets with the outer edge entire or shallowly lobed. 



c. Sori rather numerous, typically 3 — 6, sometimes 2 to a leaflet. 

 d. Leaflets often dimidiate or trapezoidal, the terminal ones cuneale. 



(19a) A. neoguineense. 

 (196) A. opacum. 

 d,d. Leaflets cuneato-flabellate to suborbicular. 



e. Sori in rather half-rounded hollows ; .sporangia springing 



from the veins and parenchyma. (20) A. aethiopicum. 



e.e. Sori in shallow hollows; sporangia springing from the 



veins only. (21) A. suborbiculare. 



C.C. Sori few, typically d — 2, sometimes 3 to a leaflet. 



(22) A. celebicum. 

 b.b. Leaflets with the outer edge rather deeply lobed. 



Lower leaflets of the pinnae overlapping the main rachis, adpressed 

 I to it. /;,i4«, 



•J- Lowest piunae more or less abbreviated. (23) A. concinnum. 

 f f Lowest pinnae not abbreviated. (24) A. tinctum. 



Lower leaflets not overlapping the main rachis. 



