320 74 



tapering from base to apex as in D. pachyracbis. Distinct aërophore. Lower basal 

 segment as a rule a little longer than the next. 15—18 pairs of simple veins. 

 Sori medial or a little above the middle of the vein with a persistent, glandulose 

 indusium. 



Jenman's Nephrodium Sherringii seems to me according to his description to 

 be D. Sprengelii or, possibly, D. Mercurii. His remark that it differs from D. Sprengelii 

 by its pinnæ not being gradually narrowed from base to apex seems to show, that 

 he has misunderstood the true D. Sprengelii. His Neph. Sprengelii is perhaps partly 

 D. pachijraclüs. 



66. Dryopteris Mercurii (A.Br.) Hieron. in Hedwigia 46: 335 

 tab. 5 fig. 9. 1907 — [Fig. 43J. 



Syn. Aspidiiim Mercurii A. Br. in Herb. Berol.; Christ, Bull. Boiss. II. 6: 58. 

 1906 (nomen solum). 



Type specimen cultivated in Hort. Berol. 1859 (HB!). 



Specimens examined: 



Mexico: S. Christobal, G. Munch (HC). 



Guatemala, Regel n. 12702 = Warsewicz n. 89 (HB). — Cubilquitz, 350 m., 

 Türckheim ed. Donnell-Smith n. 8339 (HC). 



Costa Rica: Tuis, 650m., Tonduz n. 11332 (HC). - H. Pittier n. 6929 (HC).— 

 Boca Culebra, 50 m., Pittier n. 12323 (HC). — Wercklé 1904 (HC). — Meseta, Alfaro 

 n. 16899 (HC). — Aguacate, C. Hoffmann n. 724 (HB). — Forêts autour de S'« Domingo 

 de Golfo Dulce, Tonduz n. 9885 (HB). 



Columbia: Stübel, Filices n. 404 (HB). — Sta. Marta, Stübel, Filices n. 363 (HB). 



Venezuela, Ins. Margarita, 450 m., J. R. Johnston n. 190 (HH) (distributed as 

 Gymnogramme gracilis (Hew.). 



Ecuador: Quito, Sodiro n. 2316 (HC). 



This species, recently fully described by Hieronymus, is a very near ally of 

 D. Sprengelii, but it may, as a rule, be distinguished by its rachis, costæ and 

 margins being furnished with rather long hairs, its underside much more sparsely 

 glandulose, not rarely entirely eglandulose. Texture very thin. The segments 

 separated by broad, open sinuses, not so closely placed as in D. Sprengelii. 



67. Dryopteris Stübelii Hieron. Hedwigia 46: 340 tab. 6 fig. 13. 1907. 



Type from Columbia: Bogota, leg. Stübel n. 439 (HB!) — in valle fluminis 

 Rio Paez, Stübel n. 146 (HB). 



Although the basal part of the leaf is unknown I have no doubt that this 

 species is a near ally of D. Sprengelii and D. Cahadasii, but considerably different 

 from both. The stellate hairs are, as in D. Caitadasii, confined to the rachis and 

 costules beneath. Sori a little below the middle of the vein. 



