57 



109 



lower pinnæ nearly or quite free, lobato-pinnatifid. Veins about 7 — 8 to a side, once 

 or twice forked, the branches occasionally anastomosing, not reaching the margin. 

 Sori at the base of the anterior branch of the vein, small, a little oblong exindusiate. 

 In general habit, colour and texture very like D. refulgens but totally different 

 in venation and scales and 

 much more deeply cut. 



49. Dryopteris yungensis 

 Christ et Ros.; Rosenstock 

 in Fletde. Repert. 5: 234. 



1908. - Fig. 11a. 



Type from Bolivia: 

 Yungas australis, Sirapuya 

 pr. Yanacachi, 2000 m, leg. 

 O. BucHTiEN nr. 493 (auth. 

 specini. in RB!). 



Closely related to D. 

 honesta and perhaps not spe- 

 cifically distinct. It differs 

 by the position of the sori, 

 which are placed at the 

 middle of the anterior branch 

 of the forked vein, and by 

 the structure of the scales 

 of rachis and costæ beneath, 

 which are bi'oader, yellowish, 

 the cells with large, clear 

 lumina (fig. S'**). In all other 

 respects the two species are 

 nearly identical. 



50. Dryopteris leptosora 

 C. Chr. Index 274. 1905. — 



Fig. lid. 



Syn. Nephrodium micro- 

 sorumHook.spec 

 fil. 4: 106. 1862; 

 Syn. fil. 271. 



Driiopteris microso- F'g- H- o. D. yungensis Christ, et Ros. (orig.). — b. D. honesta 



^ „, n ; (Kze.) C. Chr. iSpitucE 4742) — c. ö.p?a/yZo6a (Bait.) C. Chr. (orig.) — 



■ d. D. leptosora C. Chr., two segments seen from the underside and 



3: 813. 1891. one seen form above (orig.) — All pinnæ X *l:„ segments x I'/a. 



D. K. D. Vidensk. Selsk. Skr., 7. Række, naturvidensk. og mathem. Afd. X. 2. 15 



