﻿22. DRYOPTERIS. § 1. LASTRAEA. l?"^ 



(?.(?. Lower secondary segments very small. 



(16) D. vulcanica. 

 7.7. Stipes more or less finely villose or pu- 

 bescent, at least on the upper side (*). 



.'. Under surface villous. 



(17) D. calcarata. 

 !.!. Under surface naked or glandular. 



•{•, Densely glandular. 



(18) D. viscosa. 

 f .f. Naked or slightly glandular. 

 • (19) D. gracilescens. 



jS.jS. Fully developed fronds more than 60 c.M. 

 long. 



!. Stipes densely hairy. Secondary seg- 

 ments with a single tooth in the sinus 

 on the anterior side. 



(20) D. monodonta. 



!.!. Stipes scaly. Secondary segments 



without tooth. (21) D. polylricha. 



<x.a. Sori nearer the margin, or terminal on the veins (^). 



jS'. Sori immersed. (22) D. immersa. 



/3'./3'. Sori superficial. 



y'. Lowest pinnae with the lowest anterior 



segment toothed or pinnatifid, the other 



segments entire. (23) D. Peekeli. 



7'.7'. All the secondary segments similar, entire 



or crenate. 



(T. Surfaces naked. (24a) D. Dayi. 



(?'.^'. Surfaces more or less villous, 

 e. Fronds + small. 



(246) D. diversifolia. 

 e'.s'. Fronds + large. (25) D. patens. 

 2.2. Lower pinnae conspicuously reduced or dwindling down into mere 

 auricles. 

 3'. Sori medial, or lower on the veins. 



(') See also under D. hispldnla, 0. Ktze. 

 (*) See also D. gracilescens, 0. Ktze, 



FiLICES, 1^ 



