CHARACTERS OF TRIBES AND GENERA. 331 



differing only in the veins being reticulated. They are 

 placed in three different genera by authors, namely Anti- 

 gramma, Camptosorus, and Schaffneria, but, unless the dif- 

 ferent habit and forms of the fronds are taken into con- 

 sideration, they have no title to rank higher than sections 

 of Antigramma. 



Sect. 1. ANTIGRAMMA, vera. 



Fronds linear lanceolate, or ovate cordate, 6 to 12 inches long. 

 Sp. A. brasiliense (Sw.) (v v.) ; A. plantaginea, Pr. 

 (Asplenium Douglassii, Hook, and Grev. Ic. Fil., t. 150). 



Sect. 2. CAMPTOSORUS, Presl. (1836). 



Fronds lanceolate, auricled at the base, 4 to 9 inches long, 

 decumbent, recurvate, with a rooting viviparous apex, 

 forming compact patches of fronds. Sori short, 

 generally curved. 



A. rhizophylla, Pr. (v v.) ; A. sibirica (Hook.}. 



Sect. 3. SCHAFFNERIA, Fee. (1856). 



Fronds stipate, round, obovate, 1 to l inches broad, texture 

 thick, firm. Veins reticulated, without a midrib. Sori 

 oblong or linear, in irregular patches. 

 A. nigripes (Fee.) ; Kew Gard. Misc., 9, t. 9 (Scolopen- 

 drium, Hook. Syn. Fil., t. 4, fig. 41 e.). 



OBS. The two first are natives of Brazil, the third of 

 North America, the fourth of Mexico. 



189. OXYGONITJM, Presl (1836). 

 Anisogonium, Pr. (1836) ; Asplenium, sect. Anisogonium, 



Hook. Sp. Fil. ; Diplazium sp., authors. 

 Vernation fasciculate. Fronds simple or pinnate, the 

 simple ones sub-cordate, 1 to 2 feet high ; pinnaB entire, 



