Lobbiane. N. O. Filices, 
DCCCCXCVIII. 
GRAMMITIS BISULCATA, Hook. 
Frondibus sparsis anguste lineari-acuminatis curvatis rigidis 
inferne in petiolum attenuatis subsemiteretibus enerviis 
antice profunde bisulcatis sulcis soriferis, soris ovali- 
oblongis prominentibus, caudice elongato filiformi repente 
squamoso. 
Has. Borneo; near Sarawak, Thos. Lobb. 
There is no appearance of venation in the harsh, rigid fronds 
of this Fern. A transverse section (fig. 1. and 2.) shows them 
to be nearly semiterete; the flatter side is marked with two deep 
furrows in which are situated the sori, the convex side has 
three shallow grooves. The caudex is long and creeping, 
everywhere clothed with scales, throwing out roots from 
below, and bearing the distinctly placed fronds on the upper 
side. 
Fig. 1. 2. Transverse sections of a fertile frond:—magnified. 
