OF TRIBES AND GENERA. 
Sp. T. papillosa (Bi.). 
— A native of Java and the Philippine Islands. With dn 
; exception of P. vulgare this is the only representative of the 
forked free-veined Polypodic in the Eastern H emisphere, 
8.—Potrropium, Linn. in part (1737). 
Surculum generally short and thick, in some hypogeous. 
Fronds pinnatifid, pinnate, or rarely bi-tripinnatifid or 
simple, smooth, villose or squamiferous, from a few inches 
to two or three feet high, Veins once or more times forked 
free, exterior branch soriferous. Receptacles terminal, pum 
tiform, superficial. Sori round, rarely oval, transversely 
uniserial or solitary on laciniz of multipartate fronds. 
Type. Polypodium vulgare, Linn, 
Illust.—Hook and Bauer, t. 69, B. Moore iid. Fil., 
96, fig. 1. J. Sm. Ferns, Brit. and For, fig. 
Hook. Syn. Fil., t. 9, fig. 48, a, b. 
. . Oss, This genus as now restricted by me contains betweé 
S thirty and forty known species, which, with the exception 
of P. vulgare of Europe, are all natives of West Indies and 
the Continent of America, P. pellucidum extending west t 
the. Sandwich Islands. The folowing are the principal 
species arranged in sections :— 
1.—Suspensum Group. ed 
JU linear, pinnatifid or subpinnate, villose, rarel 
Smooth. Stipes long, slender, wiry, often arcuate. Veins 
. sometimes simple, or with the soriferous branch very short. 
e P. comptonimfolium, Desv. (P. scolopendrioide: 
Hook. et Grev., p. 42); P. suspensum, Linn, ; IR angler - 
folium, Linn.; P. cultratum, Willd. ; ; P. Phlegmaria, 
Sm.;*. P. lanigerum, Eat; P. semiadnatum, Hook. ; : 
ences Hook. ; P. melanopus, Grev. : 
UR * Lond. Journ. Bot., p. 196, vol. due 
