TAB. XCYI. 
Drymoglossum rigidum, Hook. 
Glaberrimum, frondibus sterilibus obovatis in stipitem sequi- 
longnm attenuatis costatis marginibus incrassatis nitidis, 
fertilibus longissimis linearibus crassis, stipite subaeque 
longis, soris profunde immersis, caudice repente elongato 
squamoso. 
Hab. Borneo, near Sarawak, Mr. Thomas Lobb. 
A species of Drymoglossum extremely different from any 
hitherto described, remarkable for its thick, firm, coriaceous 
shining, obovate sterile fronds, incrassated at the margin, 
tapering into a rigid stipes as long as the fronds. The fertile 
frond, including the stipes, exceeds by many times the length 
of the sterile fronds with their stipites, and is also peculiar in 
being very narrow and very thick (almost semiterete), having 
a deep furrow on each side the costa, in which the sori are 
sunk. The veins anastomose, but the areoles are not appen- 
diculated. 
Fig. 1. Portion of a sterile frond, f. 2. Portion of a fertile 
frond ; magnified. 
