DESCRIPTIONS OF THE SPECIES 
7 3 
Christensen does not maintain T. mnscoides , and finds 
Baker’s description in Syn. Fil. to include three species, the 
African plants being placed in T. erosum Willd., which he 
quotes from West tropical Africa only. Dr J. Medley Wood 
in his Handbook of the Flora of Natal, 190 7, includes T. mus- 
coides Sw.,' which he describes “Frond simple, entire or 
bluntly lobed,” and adds “ A variety of this species was 
found by the writer on wet rocks, Ungoya forest, Zululand. 
Not seen since.” This is evidently the locality referred to in 
the letter quoted above. 
T. erosum is distinguished from T. montanuni by having 
the involucre sunk into the frond with only the mouth free, 
and that surrounded by a rim, but hardly two-lipped. The 
frond, like that of T. montanum , varies considerably in outline; 
sometimes lanceolate lobed; more frequently when full sized 
obovate or oblong, with a cuneate base ; a half to one inch 
long, a quarter to half inch broad, with a slender stipe a half 
inch or more long, and is either entire or divided along the 
margin into several short rounded lobes. Sori terminal on 
the veins in the upper lobes, sunk entirely into the lamina 
with a free spreading rim, hardly two-lipped. When young 
the fronds are set with simple or stellate hairs which soon 
disappear. The stipe is continued through the frond as a 
strong mid-rib, pinnately forked into the lobes, and the 
strongest again forked or pinnate. Besides these veins there 
are numerous parallel venules not connected with these pri- 
mary veins, but connected along the margin by a more or 
less distinct marginal vein. The above description and figure 
are from specimens from Fernando Po, kindly forwarded to 
me from Kew. 
In the absence of South African specimens this species is 
included here with doubt, the difference between it and T. 
montanum being not greater than the variation which occurs 
within one tuft of T. montanum. 
Genus 2. Hymen ophyllum Smith. 
Very delicate little plants, with creeping, and generally 
matted, slender rhizomes, growing in tufts . on stones or trees, 
