340 J. G. BAKER ON SOME T^EW SPECIES OF HYMENOPHTLLACEiE. 



placed liere amongst the simple-fronded species, or amongst the 

 pinnatifid species by the side of T. quercifolivm^ may be con- 

 sidered an open question. It is not at ail likely to be confused 

 "with any of the species which have been enumerated. 



Of the eighteen species, eight are confined to the K'ew World, 

 nine to the Old, and one is common to both. Pour only are 

 extratropical, Tropical America producing eight species, the 

 Pacific islands five, Tropical Africa (including the Mauritius) 

 three, and Tropical Asia one. Europe is the only continent 

 from which they are absolutely excluded- 



I take also the present opportunity of describing a very minute 

 simple-fronded JLymenoj^liyllum from the Malayan peninsula, 



Hymenophyllum parvifolium, n. sp. Frondibus lineari-oblongis 

 indivisis vel uni- vel bifurcatis, costa centrali sola, venis lateralibus 

 nuUisj venulis spuriis liberis, Involucro solitario ineluso, ore late alato. 



Ehizome slender, wide-creeping, tomentose. Stipes a line long 

 or less, naked or slightly tomentose, Prond two to three lines 

 long by a line broad, linear-oblong, undivided or once or twice 

 cleft at the apex, sometimes sliglitly, sometimes nearly halfway 

 down, with a central costa only, which runs down the centre of 

 each lobe when the frond is divided; lateral veins none, but 

 marked with faint irregular free sj)urious venules ; the margin 

 slightly undulated, glabrous; the sorus solitary, terminal; the 

 involucre globose-triangular, narrowed into the costa, about as 

 deep as the convex broadly rounded valves. 



Moulmein, Rev, C. Parish, 1862. 



Eesembling closely Triehmnanes Barklianiim and Vitiense in 



of the fruit, 



' Kew, March 1866. 



Hymen 



EXPLANATION OF PLATE Vllf 



A. Trichomanes GodmanL 



B. T, Rohinsgni. 



C. T.peltatum. 



D. T. Vitiense, 



E. HtfmenophyJhim^arvifoUum, 



F. Tricliomanes Barklianum. 



1, in each case, the plant, natural size. 



2, portions, more or less magnified. 



