4S0 35. ASPLENltra. § 5. KU-ASPLENIUllt. 



X. Veins distinctly visible beneath. 



(B7) A. macrophyllum. 



x.x. Veins sunk, indistinct beneath. 



(58) A. paradoxum. 



C.C.C. Pinnae dimidiate or subdimidiate, i. e. at least the lower ' 3 of 



the lower side cut away along the costa. 



d. The lowei' side of the pinnae quite cut away. 



(S9) A. heterocarpum. 

 d.d. The lower '/s — Vs °f '^^ lower side cut away. 



e. Stipe and rachis purple or black-brown, sometimes grey. 



(6O0) A. unilaterale. 

 (606) A. filipes. 

 e.e. Stipe and rachis green. (61) A. obscurum. 



a.a. Fronds pinnate; pinnae deeply pinnalifid, or pinnate at the base. 

 ±. Fronds small or middle-sized, under 45 c.M. long. 

 2'. Secondary segments undivided. 



3'. Pinnae ovate, the lobes cuneate-oblong. (62) A. denticulatum. 

 3'.3'. Pinnae linear-lanceolate, the lobes linear-cuneate. 



(65) A. Warburgianum. 

 S'.S'. At least the lower secondary segments on the anterior side 

 shallowly or deeply 2 — 3-fid ('). 



•J>. Lowest anterior segment rather broader than long, + 



spreading. Sori short, oblong. (64) A. laciniatum. 



•{•••{•. Lowest anterior segment longer than broad, erecto-patent. 



Sori long, linear. (65) A. Hagenii. 



±.±'. Fronds large, more than 45 c.M. long when fully developed. (') 



(66) A. horridum. 

 a.a.a. Fronds more copiously 2 — 4-pinnate (*). 



v. Ultimate segments small, lanceolate-spathulate, acute or incised with 

 2 — S sharp, entire teeth at Ihe apex. (67) A. tenuifolium. 



b'.b. Ultimate segments oblong or cuneate-oblong, the outer edge more copi- 

 ously crenulate to dentate, or incised and crenulate to dentate. 

 c'. Fronds 2 — 3-pinnate. 



d'. Rachis pilose, fibrillose or scaly, at least when young. 



(') See also A. stercophyllnm, Kze. 



(•) With regard to , the tielermination of the species a very difficult group and not 

 always clearly distinguished from group a.a, 

 (') See also A. caudatanr, Forst. 



