336 J. O. BAKEK O:?^ SOME KEW SPECIES OE HTMEXOPHYLLACEJE. 



and these it is the principal object of the present paper to cha- 

 racterize. Three out of the five were recognized as distinct, and 

 named in manuscript by Sir AV. Hooker. I propose to give 

 a list of all the known species, including the novelties, arranged as 

 in the * Species Filicum,' separating them into four groups, 

 according to the character of the venation, and the absence or 

 presence of the fainter intermediate veins, which Hooker calls 

 reticulations, and Van den Bosch vense spurise, and to begin in each 

 with the simplest and proceed towards the more divided forms of 

 frond. The genera of Presl are founded upon the number of 

 layers of cellules in the frond, and the circumstance of whether 

 the mouth of the involucre be entire or shows a tendency to divide, 

 as in Hymenophyllum^ into two distinct lips. 



Grenus Thichomanes, Smith. 

 Subgenus Eutrichomanes^ Hooker. 



Section 1. Fronds quite simple^ o?' slightli/ lobed. 



§ Venation flabellate. 



* Without spurious veins. 



1. T. RENiFORME, For^f ; (Cardiomanes) Pres/. 

 New Zealand. 



2. T. lineolatum, (Hemiphlebium) V. d. B. 

 Tropical America, both islands and mainland. 



** Spuriously veined, 



3. T. peltatum, n. sp. Frondibus imbricatis tenuiter membranaceis 

 sessilibus peltatis suborbiculatis, venis et venulis spuriis flabellatim 

 dispositisj involucris paucis inclusis, ore late dilatato. 



r 



Ehizome wiry, slender, wide-creeping, tomentose. Fronds quite 

 sessile, attached to the rhizome near the centre or towards the 

 base, suborbicular in general outline, half an inch to an inch and 

 a half across each way, quite adpressed to the surface on which 

 they grow, and conspicuously overlapping one another, bright 

 green and delicately membranaceous in texture ; the margin un- 

 dulated, wavy, and sometimes rather deeply cleft in a direction 

 from the circumference to the centre ; the veins brownish, wavy, 

 and closely placed, several times dichotomous at a small angle, 

 with numerous interrupted spurious veins between them at the 

 margin and towards the centre ; son scattered, one to three in 

 number; involucres cylindrical, coriaceous in texture, more or less 

 eiserted, with a very much dilated slightly two-lipped mouth- 

 Samoa, July 1864, PowelL no. 126. 



