CHARACTERS OP TRIBES AND GENERA. 95 



three sections, namely, Euphymatodes, Pleuridium, and 

 Vrynaria. Under Pleuridium he places sixteen species, 

 which although they all agree in having compound vena- 

 tion and compital sori, nevertheless as they differ in habit, 

 I restrict the species to those bearing the above character. 



* Sori oblique uniserial. 



P. crassifolium, (Linn.), (v v.) ; P. albo-punctissimum 

 (Linden's Cat.) (v v.) ; P. crassinervum (Bl.) (v v.) ; P. 

 vulcanicum (Bl.) 



** Sori oblique biserial. 



P. rupestre (Bl.) (v v) ; P. triquetrum (Bl.) (v v.) 

 The two first are natives of West Indies and Tropical 

 America, the others of Malay and Philippine Islands. 



13 CAMPYLONEUBUM, Presl (1836). 



Cyrtophlelium, E. Br. ; J. Sm. Gen. Fit., 1841 ; Polypodium, 

 sp. auct. Hook. Sp Fit. 



Surculum short, csespitose, or elongated, often sub- 

 hypogeous. Fronds simple, linear lanceolate or broad 

 elliptical, or pinnate, firm, rigid, 1 to 2 feet high. Primary 

 veins costceform or undefined, elevated, or internal and 

 obscure. Venules arcuately or angularly transversely anas- 

 tomosing, producing two or more excurrent free veinlets, 

 uniform, or sometimes irregular. Receptacles punctiform, 

 terminal, or medial on the free veiniets. Sori round, 

 oblique biserial, or irregular, destitute of scales. 



Type. Polypodium repens, Linn. 



Illust. Hook, and Bauer., Gen. Fil. t. 71 A. Moore, Ind. 

 Fil. p. 60 ; J. Sm. Ferns, Brit, and For., fig. 27 ; Hook. 

 Syn. Fil. t. 5, fig. 48, j. 



OBS. This genus consists of about a dozen described 



