294 PROF. OLIVER ON NEW PLANTS FROM RORAIMA. 
ENTEROSORA, nov. gen. 
Sori oblongi vel oblongo-cylindrici exindusiati ad venas decurrentes, intra frondis 
laminam orti, demum ad frondis faciem inferiorem rimis angustis obliquis imper- 
fecte obvii. Venæ pinnatz, venulis paucis ascendentibus prope frondis marginem 
anastomosantibus et areolas steriles hexagonas soro unico centrali includentes 
formantibus. 
Most resembles Gymnogramme, 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). ExrEROsORA CAMPBELLII, Baker. (Plate LV. figs. 1—5.) 
The only species: upper slopes of the mountain, with Polypodium trifurcatum. Root- 
stock cylindrical, suberect, densely clothed with small brown membranous lanceolate 
paleze. Stipes slender, brown, егесі, wiry, 4-5 in. long, with a few very inconspicuous 
spreading fibrillose palee 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 areole, with a single vein bearing а sorus in 
the centre of each. Sori 1—5 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. 
Frond 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 STIPULATA, Kunze. Upper slopes of the mountain. New to 
Guiana. 
229, 231. ACROSTICHUM LATIFOLIUM, Sw. Upper slopes of the mountains. Two dif- 
ferent varieties, both rigid in texture, narrowed very gradually from the middle to 
the base, and 229 dotted over the under surface with minute subpeltate brown palez. 
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. CRINITUM, nov. var.  Кеседев from the 
Brazilian and Colombian type of the species towards 4. 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 palez, as in the Venezuelan 4. Reichenbachit, 
Moritz. Path to the upper slope. The species is new to Guiana. 
