117 



169 



185. Dryopteris densisora C. Chr. Ind. 261. 1905. 



Syn. Aspidiiim costale Melt., Kuhn, Linnaea 8(»: 111. 1869. 

 Nephrodiiim costale Bak. Sj'n. 495. 1874. 



Type from Venezuela, Fenoler nr. 476 (not seen, not found at Kew). 

 Although I have not seen an authentical specimen I do not hesitate to refer to 

 this species several specimens from Costa Rica, which exactly correspond to the 

 original description. Most of these specimens I have previously determined as Ü. 

 Leprieurii var. palmensis (Christ) considering them not specifically différent from 

 D. Leprieurii and using a MS name of Dr. Christ for the variety. 



D. densisora is very closely allied to D. Leprieurii and it is perhaps only a 

 variety of it. It differs by the glabrous surfaces, being sparsely strigose along the 

 costæ only, and especially by the inframedial or subcostular sori, which are fur- 

 nished with a very large, subbuUate and siibglabrous indusiuni. Veins about 12- 

 jugate, scarcely raised above. As to all other characters it agrees with D. Leprieurii. 



Costa Rica: La Palma, Tonduz nr. ri-'i/ö ,C. W), Weucklé (C, CC), A. et C. Bkadk nr. 347 (R). 

 Panama: Maxon nr. 5605 (W). 



186. Dryopteris valdepilosa (Bak ) C. Chr. Ind. 299. 1905. — Fig 22. 



Syn. Nephrodium valdepilosum Bak. Journ. Bot. LSJSl : 204. 



Type from Colombia, province of Antioquia, Kalrreyer nr. 1347 and 1871 

 (Kew!), and very typical speci- 

 mens were collected in Costa 

 Rica by J. J. Cooper (W). 



A most distinct species, re- 

 markable by its stipe and rachis 

 being very densely clothed with 

 long, soft, patent light brown, 

 pluricellular hairs; similar hairs 

 but shorter and fewer are found 

 on the coslæ, costulæ and veins 

 of both sides. These long hairs 

 are (as seen in nr. 1871) decidu- 

 ous and under them is a rather 

 dense layer of very short, uni- 

 cellular hairs; costæ above also 

 with many long but antrorse 

 hairs; leaf-tissue of both surfaces 

 pubescent by minute adpressed hairs. Fronds dimorphous, if the fertile frond of 

 nr. 1347 really belongs to the same plant as the sterile one. Sterile lamina on 

 a stipe 20 cm long, lanceolate, 40— 50 cm long, 15— 20 cm broad at the middle, mem- 

 branous, greyish green. Pinnæ close, sessile, lower ones much reflexed, scarcely 



D. valdepilosa (Hak.) C. Chr. (Kalbkeyer 1347). a. pinna ot 

 sterile leaf X *l;r, b. two segments from the underside and 

 c. one segment seen from above of the same pinna, X I'/a; 

 d fragment of the same from the upperside X 4: e. pinna 

 of fertile leaf x ^/s; f- segments of the same, x Vh. 



