Evans: Hepaticae from Florida 183 



other, making them appear distinctly alternate, and under these 

 circumstances the wing may become exceedingly narrow or even 

 obsolete. On a typical leaf the apex is broadly and more or less 

 obliquely truncate and bears at each angle a sharp and slender 

 tooth, the teeth usually diverging from each other. On a poorly 

 developed leaf the teeth are often much less divergent or even 

 subparallel and include between them a lunulate to acute sinus ; 

 on such a leaf the teeth are larger than on a typical leaf, and the 

 postical tooth is appreciably larger than the antical. 



The true Lophocolea connata, with which Z. Martiana was 

 originally confused, is also "widely distributed in the American 

 tropics and may perhaps be expected in southern Florida. It is 

 distinguished by its bifid underlcaves and by its less spinose 

 bracts and bracteoles. Both species are autoicous. 



3. DiPLASioLEjEUNEA UNiDENTATA (Lehm. & Lindcnb.) Schiffn. 

 Bot Jahrb. 23 : 583. 1897. 



Jimgerman7tia nnidcntata Lehm. & Lindenb. in Lehmann, Pug. 

 Plant. 6 ; 48. 1834. 



Lejeunea unidentata Mont, in Ramon de la Sagra, Hist. Fis. Pol. y 

 Natur. Cuba 9: 478. pL ig^f^ 2. 1845. 



Lejeunea {Diplasio-Lejettned) tinidentata Steph. Hedwigia 29: 90. 



1890. 



In hammocks near the homestead trail, near Camp Longview 

 {Small & IVilsoUy mixed with 20j8). Widely distributed in the 

 West Indies. 



The genus Diplasiolejeunea has not before been reported from 

 the United States. It is distinguished from all the other genera of 

 the Lejeiineae (except Colurolejeuned) by the possession of double 

 the usual number of underleaves j in other words, this genus devel- 

 ops one underleaf for every leaf instead of for every pair of leaves. 

 The underleaves are inserted on the axis at approximately the same 

 level as the corresponding leaves. Aside from the duplication of 

 the underleaves the genus is closely related to Cololejeioica^ the 

 lobules being built up on essentially the same plan. 



In D, tinidentata the leaves are destitute of hyaline margins 

 and the lobe is orbicular or broadly ovate in outline. The leaf- 

 cells are either plane or slightly convex. The lobule is inflated 



