32 PROF. M. W. HABETXGTOX ON TROPICAL FERNS. 



wise naked ; texture membranous ; venules simple, free, falling 

 short of the margin ; sori confined to the upper part of the frond, 

 immersed, oval, 5-10 in a row on each side of the midrib, about 

 • halfway between it and the margin. The edge of the cup, in which 

 the sorus is sunk, forms a projecting rim, but does not cover the 



sorus. 



G-rowing in small drooping tufts, some distance up the trunks 

 of trees, Mount Mahayhay, Philippines. 



Closely related to the P. Schenkii just preceding, but distin- 

 guished by its shorter stipe and by its sori, which are confined to 

 the upper part of the frond, oval in shape and not covered by the 

 rim of the depression. 



PoLTPODiUM ABNASCENS, Swarfz. Tcmate, Philippines. 



P, LINGUA, Sit\ Swatow, China, 



P. ACCEUENS, Blwne. Luzon. 



299*. P. (PiiYMATODEs) HAMMATisoRUM, Harrington^ n. sp. 



Ehizome long and slender ; scales thin, membranous, long-lan- 

 ceolate, light brown; stipes scattered along the rhizome, i-l^ iii* 

 long for the sterile frond, 1-3 in. long for the fertile, slender, 

 naked, erect ; sterile frond elliptical, |-1| in. long, |-1 in. 

 broad, obtuse, coarsely and shallowly crenate, except at the 

 tapering base ; sterile frond linear, 2-5 in. long, 2 lines broad, 

 with a lobe under each sorus ; texture coriaceous; surfaces 

 smooth ; veins immersed ; midrib distinct ; sori about 20 in a row 

 on each side of the midrib, nearly opposite, large, giving the fer- 

 tile frond a knotted appearance. 



Mount Mahayhay 



rostratwn. Hooker 



311 



m 



Stipes very short or none ; frond 5-12 in. long, 1-2| in. broad, 

 simple, oblong-oblanceolate, obtuse to acuminate above, gradually 

 tapering below ; margin entire, slightly thickened ; surfaces 

 naked ; texture coriaceous ; midrib strong ; sori copious, small^ 

 irregularly scattered, on the ends of free or backs of united vein- 

 lets ; areolae abundant, irregular. 



Shaded places under overhanging rocks, Apes' Hill, Takow, For- 

 mosa. 



Near P. superficiale^ Blume, but distinguished by its thicker 

 texture, smaller and more numerous sori, and the very short stipe. 



P. TRiQUETRUM, Bh Temate. 



Philippines. 



/3, ZiPPELLTI, H. 4f 



