[From the Bulletin of the TVrrey Eotanical Club 41: 391-410, ph. 15-20. 24 Au 1914. 



A revision of the genus Vittaria J. E, Smith 

 I. The species of the subgenus Radiovittaria 



(WITH PLATES 15-20 AND SEVEN TEXT FIGURES) 



Ralph C. Benedict 



In an earlier paper on the genera of the fern tribe Vittarieae* 

 the writer endeavored to point out the natural generic and 

 subgeneric groups of the tribe, to discuss as well some of the 

 interesting morphological features, and to indicate also the prob- 

 able relationships of the genera. The present paper deals 

 with the species of one of the subgenera of Vittaria indicated in 

 the earlier paper. Most of the work of which the results are 

 presented here was done before the paper on the genera was 

 published, but completion was delayed until the present. As 

 indicated by the title of this article, it is intended to continue the 

 study of the species of Vittaria, and it may be added, most of the 

 necessary work has been accomplished. 



The genus Vittaria as delimited in the writer's paper already 

 cited includes all those species of the tribe Vittarieae which have a 

 midvein with uniseriate lateral areolae along each side formed 

 by the pinnate interlocking simple veinlets. (See Figs. 1-3; 

 also the illustrations of venation under each plate.) As it appears, 

 this type of venation is practically unique among ferns, the only 

 possible exceptions being two or three species in the genus Poly- 

 podium L., as used in a broad sense. From such species as these 

 the species of Vittaria differ largely not only in general aspect, 



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* Bull. Torrey Club 38: 



153-190. pi. 2-8. 1911. 



391 



