294 PROF. OLIVER ON NEW PLANTS FROM RORAIMA. 



Enterosora, nov. gen. 



Sori oblongi ye] oblongo-cylindrici exindusiati ad venas decurrentes, inti*a frondis 

 laminam orti, demum ad frondis faciem inferioreni riinis angustis obliquis imper- 

 fecte obvii. Vena? pinnate, venulis paucis ascendentibus prope frondis marginem 

 anastoinosantibus et areolas steriles bexagonas soro unico central! includentes 

 forrnantibus. 

 Most resembles Gi/muof/ramme, from which it differs mainly by having the sori 



immersed in the centre of the frond, and only appearing very partially on its lower 



surface even in a mature stage. 



184 (ex parte). Enterosora Campbellii, Baker. (Plate LV. figs. 1-5.) 



The only species : upper slopes of the mountain, with Polypodium irifurcatwm. Root- 

 stock cylindrical, suberect, densely clothed with small brown membranous lanceolate 

 palea\ Stipes slender, brown, erect, wiry, 4-5 in. long, with a few very inconspicuous 

 spreading fibrillose palea? downwards. Lamina oblanceolate, simple, subcoriaceous, 

 glabrous, 6-8 in. long, under an inch broad, obtuse, narrowed gradually to the base, 

 conspicuously repand on the margin, with broad rounded lobes. Veins very distinct when 

 the frond is held up to the light, arranged in pinnate groups, one opposite each lobe, the 

 sterile veinlets forming unequal hexagonal areolae, with a single vein bearing a sorus in 

 the centre of each. Sori \-^ in. long, 4-6 to each of the central pinnated groups, erecto- 

 patent as regards the whole lamina, seen partially at last on the lower surface by slits 

 that seem as if they were made with a knife through the epidermis. 



Erond in shape and texture much resembling that of Polypodium trifurcatum, from 

 which it differs by its long stipes and totally different veining, in addition to the entirely 

 dissimilar shape and position of its sori. In naming it after the late W. H. Campbell, 

 Esq., I am carrying out the wish of Mr. im Thurn. 



170. Vittaria lineata, Sw. Upper slopes of the mountain. 



212, 218. Vittaria stiptjlata, Kunze. Upper slopes of the mountain. New to 

 Guiana. 



229, 231 . Acrostichtjm latifolium, Sw. Upper slopes of the mountains. Two dif- 

 ferent varieties, botli rigid in texture, narrowed very gradually from the middle to 

 the base, and 229 dotted over the under surface with minute subpeltate brown paleae. 



233, 238. Acrostichum Lingua, Raddi. 



267. Acrostichum stenopteris, Klotzsch. In the neighburhood of the encampment. 

 New to Guiana. 



266. Acrostichum decoratum, Kunze. In the neighbourhood of the encampment. 



278. Acrostichum Aubertii, Desv., var. crimtum, nov. var. Recedes from the 

 Brazilian and Colombian type of the species towards A. villosum by its much more 

 crinite lamina both in the sterile and fertile frond, and by the stipes being densely 

 clothed with squarrose subulate brown palese, as in the Venezuelan^/, lleichenbachii, 

 Moritz. Path to the upper slope. The species is new to Guiana. 



