APK. m2.i ^, jj^ YA TA.-SOME PLANTS FROM FORMOSA. 199 



in the soriferous portions of the fronds ; but thev are found 

 scattered in numbers in the middle portion of the fronds, where 

 they shows some reticulations. 



Another plant which I may here mention is a new species 

 of Peranema which I would propose to call P. formosana. It 

 was first collected by myself in this trip to the Arisan. The 

 fern was found abundantly in shady places along a valley 

 near the station in the same mountains. When I was walking 

 along the rivulet collecting plants here and there, my attention 

 was called by a fern of no peculiar appearance which was as 

 tall as Ptens quad Hpinnata, or Diplazium Doderleinii, with a 

 deltoid frond 1 m. long, and a stipe of nearly equal length, 

 clustered by three or four on the apex of a under-ground, 

 asscending, stout rhizome of nearly 20 cm. in length. In 

 turning over the frond and looking attentively on the under 

 surface, I was at once struck with the singular shape of a 

 sorus-a black globule on a stalk-which might be taken for 

 a sporangium of a Myxomycete. An examination with a hand- 

 lens revealed me clearly that it was a sorus with an inferior 

 involucre, supported on a stalk, once or twice as long as itself. 

 The fern should undoubtedly be referred to Peranema'^ on ac- 

 count of the characters just mentioned. The species belonging 

 to this genus at present known to us are two in all ; one is 

 P. cyatheoides,'^ a native of the Himalayas which extends to 

 east as far as Western China; the other is P. luzonica,'^ an indi- 

 gene to the Island of Luzone, which is different from the 

 Himalayan plant by the hirsute fronds. The new fern closely 

 resembles the two just mentioned, but differs from the former 

 by the hirsute pinnules, and from the latter in having acuminate 

 pinnules with truncated lobes. The following description is 

 drawn up from an example, which I think the best, in my 

 collections. 



1) Peranema Dox; Diels, in N. Pflf. I.-4, ^. 159. 



2) Peranema cyatheoides D. Don ; Christ, Farnkniuter der Erde, p. 286. 



• =Sphceropteris barbalaWALi..; Hook. Sp. Fil. I., p. 54.; Hook, et Baker 

 Syn. Fil. p. 49. 



3) Peranema luzonica Copel. in Philip. Jonrn. Sci. (1909) p. 111. 



