i8o Ferns of British India and Ceylon. 



texture subcoriaceous, 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. {TJuinb.) 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. Syn. 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 pinna? 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 



