310 64 



glabrous. The basal pair of segments considerably enlarged, often lobed-toothed, 

 the upper ones toothed at their apex. Shape of lamina of type III. 



53. Dryopteris rustica (Fée), C. Chr. Ind. 290. 1905. 



Syn. Pbegopteris rustica Fée, 11 mém. 55 tab. 13 fig. 1. 1866; Pohjpodium 

 rasticmn Bak. Syn. Fil. 306. 1867. Nephrodium nimbatiim Jennian, Gard. Chron. 

 III. 15: 264. 1894; Bull. Dept. Jamaica 3: 67. 1896; Dryopteris nimbata C. Chr. Ind. 

 279. 1905. 



Type specimen from Guadeloupe, leg. L'Herminier (non vidi). Gathered 

 in the same island by Maze n. 188 (HC) and Père Duss (HB. HC). — Jamaica, 

 Jenman (HB). 



This species is very peculiar in its pubescence. The leaf is throughout — yet 

 especially on rachis and costæ — densely furnished with very fine, hamate, gray 

 hairs, nearly invisible to the naked eye. Stem up to 10 cm. long, provided at 

 the base with deciduous scales. The lower 4 — 5 pair of pinnæ auriculiform, the 

 following growing larger gradually to the middle of the lamina (the shape of lamina 

 being intermediate between the types III and IV). Lamina up to 6 dem. long by 

 2 — 2'/2 dem. broad, grass-green, firmly herbaceous, segments 10—12 mm. long, 

 c. 5 mm. broad, obtuse, with the half of their own breadth between them, the basal 

 ones sometimes a little reduced. 7 — 9 veins; sori medial, apparently exindusiate in 

 the specimens from Guadeloupe, often subelliptical. 



The specimen from Jamaica, determined above as D. rustica, is no doubt 

 Nephr. nimbatum Jenm., agreeing exactly with Jenman's description. It resembles 

 very closely the specimens from Guadeloupe, but it differs in having a small, ciliate 

 indusium. Further I refer here Phegopteris gracilis (Herv.) var. Guadalupensis Fée, 

 11 mem. 56. 1866 from Guadeloupe, L'Herminier (HC); it only differs from the 

 type by its sori sometimes being subgymnogrammoid; such sori may also, however, 

 be found in tj'pical forms. The species is really a very near ally of the species 

 referred to § Leptograinma, D. consimilis and D. heteroclita, differing mainly by its 

 very fine, nearly microscopical pubescence and its shorter sori. 



54. Dryopteris atrorubens (Mett.) C. Chr. Ind. 253. 1905 — [Fig. 34]. 



Syn. Aspidium atrorubens Mett.; Kuhn, Linnaea 36: 112. 1869. 



Type from Peru: St. Gavan, Lechler n. 2267 (HB!) 



Resembles D. rustica in its minute pubescence, in the position of the sori, in 

 colour and texture, but its sori are furnished with a distinct, setose indusium. 

 Pinnæ upcurved from the middle, with a little aërophore at the base and articu- 

 lated to the blackish, glossy, slender rachis, which is covered with short deciduous 

 hairs. Segments acute, toothed at their upper third, with 10 — 11 pair of veins. 

 The original specimen is very incomplete, wanting rhizome, stem and the basal 

 part of the lamina; its systematic position, therefore, is rather doubtful. 



