Key to the Subgenera. 



1. Lamina without true hairs consisting of a single row of one or some few cells; 



rhizome, stipe and rachises more or less clothed with scales, which can be 



very narrow, hairlike. Veins free, at least not regularly goniopteroid or menis- 



cioid. Aerophore none. 



2. Costulæ II— III or IV run out from the costa under a very acute angle. Sori 



with large, reniform, generally persistent indusia. Lamina not pellucido- 



punctate but often glandular beneath. Most species bipinnate-decompound 



with furcate veins. 



Subgenus 1. Eadryopteris (Species 1 — 11). 

 2. Costulæ run out from the costæ under an open angle. Sori exindusiate, or 

 (in the section Peltochlaena) covered by deciduous, large, peltate indusia. 

 Lamina pellucido-punctate by immersed glands. Most species pinnate-bi- 

 pinnatifid with simple veins, which do not reach the margin. Apex of pinnæ 

 sharply serrate to the very point. 



Subgenus 2. Stigmatopteris (Species 12—28). 

 1. Lamina more or less hairy by true hairs of different structure. Costulæ run 

 out from the costa under an open angle. Veins simple, rarely furcate, free 

 or anastomosing (goniopteroid or meniscioid veins). 

 2. Hairs articulated, cylindrical, rufous, consisting of 2 4 short cells (unicellular 

 hairs are found in D. leptosora and D. platyloba only); scales often many, 

 never pubescent, their margins generally more or less dentate or fimbriate 

 (not ciliated by hairs). Veins free, simple or forked, the basal ones not 

 truly connivent to sinus, i. e. their apices do not meet at the sinus. Aero- 

 phore none; glandular hairs common. Lamina bipinnatifid-decompound, 

 rarely reduced downwards. 



Subgenus 3. Ctenitis (Species 29—53). 



2. Hairs unicellular or pluricellular (in the latter case they are long, soft and 



thin, subulate), simple or branched. Scales entire or subentire, seldom many, 



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 1>. K, rj. Vidensk. Selsk. Skr.. 7. Række, naturvidensk. og nialhem. AfU X 2. " 



