Parkeriane. N. O. Filices. 
TAB. DCXLVIII. 
Hemitrevia? Guianensis. Hook. 
Inermis? rachi costaque inferne subsquamosa strigoso-hispidis, 
frondibus 2-3-pinnatis, rachi secundaria conspicue alata pre- 
cipue inter pinnulas, pinnulis sessilibus oblongo-lanceolatis 
apicibus productis obtusis membranaceis infra medium 
pinnatifidis, segmentis ovatis obtusis integris, venis liberis 
ad medium furcatis, soris 2-3 quoque segmento axillaribus 
versus marginem sitis, involucro ciliato plerumque ad latus 
inferum sori 2-3 lobato. Hook. Sp. Fil. v. 1, p. 31. 
Has. British Guiana. C. 8. Parker, Esq. 
I do not find this anywhere described, nor am I clear that it 
should not be placed in Cyathea. In habit and form of the 
pinnules, it exhibits the closest affinity with H. Parkeri, Hook., 
but the involucre is dissimilar. 
Fig. 1. Portion of a segment with sori. f. 2. Involuere and 
Sorus :—magnified. 
