i8o Ferns of British India and Ceylon. 
texture subcoiiaceous, main rachis pubescent, rachis of pinnae 
pubescent and veins beneath somewhat hairy ; veins 3-4 on each side 
in the lobes ; sori long. Hook. Syn. Fil. p. 234. Bedd. F. B. 1. 1. 195. 
Birma and the Malay Peninsula ; there is one specimen in the 
Kew Herbarium marked Khasya Griffith, but it is very probable that 
it came from Birma. 
(Also in the Malay Islands.) 
12. DiPLAZiUM jAPONicuM. {TJuinh) Rhizome creeping or 
suberect ; stipes up to 18 inches long, pubescent or glabrous; fronds 
herbaceous, 8-18 inches long, 6-8 inches broad, deltoid to lanceo- 
late pinnate ; rachises and costa more or less woolly, with crisped 
hairs mixed with small scales, or almost quite glabrous; pinnae 6-12 
on each side, below the pinnatifid apex, alternate, subopposite, or 
the lower ones quite opposite, some of the lower ones petioled, upper 
ones sessile or decurrent, all pinnatifid either half-way to the rachis 
or quite down to a winged rachis ; segments nearly entire, with a 
toothed rounded or falcate apex, or rather deeply pinnatifid ; veins 
pinnate in the lobes ; veinlets simple or forked, often somewhat 
hairy or with minute crisped scales ; sori linear, commencing near 
the midrib and rot quite reaching the margin. Thunb. Fl. Jap. 334. 
Diplazium Thwaitesii (A. Br.), Hook. Syji. Fil. 235. Bedd. F. S. I 
291. D. lasiopteris (Mett.), Hook. Syn. Fil. 235. Bedd. F. S. I. 
i. 160. Diplazium decussatum (Wall.), Bedd. F. B. I. 292. 
D. polyrhizon. Baker ^ Syn. Fil. 490. 
I have followed Mr. Clarke in reducing all these species to 
japonicum ; the typical lasiopteris of Southern India has the fronds 
more hairy and generally lanceolate in shape, the lower pinnae being 
reduced ; but some Japan examples are quite as lanceolate in shape; 
typical decussatum has short very deltoid fronds, and Thwaitesii is 
only a large form of decussatum ; if only examples from certain 
geographical areas are examined, lasiopteris and decussatum might 
well be looked upon as distinct species, but when large suites 
of specimens from an extended area are compared, is is impossible 
to keep up the supposed different species even as good varieties, they 
quite run one into the other ; I have found typical decussatum with 
