93 145 



I have not seen the type-specimen but numerous specimens from the type- 

 locality collected by Arsène (RB). Unfortunately they are all sterile and without 

 rhizome. Judging from these specimens I cannot with certainty distinguish them 

 from D. tbelypteris, which has not been found in tropical America; Dr. Christ' 

 however, finds that it differs from D. tbelypteris by its plane fertile segments and 

 minute, remote sori. I, therefore, prefer to let it stand provisionally as a species. 

 It is widely difTerent from all other tropical American species of ^ Lastrea by its 

 non-attenuate lamina and normally furcate veins. 



138 D. siambonensis (Hieron.) C. Chr., Revision nr. 63 fig. 41. 

 Area: Argentina. 



139. D. achalensis (Hieron.) C. Chr., Revision nr. 64. 

 Area: Argentina. 



140. D. Sprengelii (Klf.) O. Ktze.; C. Chr. Revision nr. 65 fig. 42; Smiths. Misc. 



Coll. 53: 387. 

 Area: West Indian Islands, common; Mexico along the Andes to Ecuador. 

 Nephrodium Sherringii Jenm. Journ. Bot. 1879: 261, from Jamaica, of which I 

 have now seen an authentical specimen (Kew), I regard as a large, luxuriant 

 variety of D. Sprengelii. It agrees with typical Sprengelii in colour, texture and 

 pubescence, but it is much larger with pinnæ 12—20 cm long, 3 — 5 cm broad, the 

 segments of larger pinnæ about 3 cm long, 'a cm broad, deeply lobed with the 

 tertiary veins furcate or even pinnately branched in the lobes. 



141. D. struthiopteroides C. Chr., Smiths. Misc. Coll. r>2: 388. 

 Area: Guatemala. 



142. D. Mercurii (A. Br.) Hieron.; C. Chr. Revision nr. 66 fig. 43; Smiths. Misc. 



Coll. 53: 389. 



Area: Mexico along Andes to Ecuador. 



It is highly questionable, whether this is specifically distinct from D. Sprengelii. 

 I am nearly sure that it is not. Specimens from Panama (Maxon nr. 4696 and 5767J 

 show the pubescence of D. Mercurii but are otherwise jnot different from D. Sprengelii. 



143. Dryopteris conformis (Sod.) C. Chr. Index 258.|1905. — Fig. 16 b. 



Syn. Nephrodium conforme Sodiro. Rec. 45. 1883; Cr. vase. quit. 240. 1893. 



Type from Ecuador, leg. Sodiro (Kew!); very typical specimens were 

 collected at Mt. Pifl by A. Mille (RB). 



In texture, habit and size very like D. Sprengelii, but lamina throughout 

 shortly pubescent, mostly so on the costæ of both sides but the leaf-tissue of both 



