—52— 



The present species is the fourth member of the genus Cololejeunea (in its 

 restricted sense)' to be reported from the United States, the others being 

 C. BiddLecondae (Aust.) Evans, C. diaphana Evans, and C. minutissirm (Smith) 

 Schiffn. A fifth species, C. Jooriana (Aust.) Evans, has recently been trans- 

 ferred to the genus Leptocolea by the writer and is now knawn as L. Jooriana, 

 (Aust.) Evans. 



Cololejeunea setiloba Evj 



Figs, i and 2. Robust sterile stems, ventral view, x 45- 



Fig. 3- Antheridial spike with two female inflorescsncss on short branches, ventral view, 



X 45. 



Fig. 4. Tip of a robust female branch with perianth and sporophyte, ventral view, x 45 • 

 Fig. 5. Apex of a robust lobe, X 250. 



Fig. 6. Tooth of a lobule, the terminal cell being a hyaline papilla, x 250. 

 Fig. 7. Gemma, X 250. 



The figures were all drawn from the type specimen. 



The most remarkable feature of C. setiloba is the lobule, which differs con- 

 siderably in structure from the lobule found in the other species of the genus 

 (Fig. 6). Instead of being large and inflated it is small and plane. Instead of 

 bearing two (or more) marginal teeth it bears a single tooth. This tooth, how- 

 ever, which is homologous with the apical teeth of the other species, is well 

 developed and usually consists of a row of three or four cells, instead of being 



^See Evans, Bull. Torrey Club 38 : 251-286. pi. 11, 12. 1911. Reference should be made 

 to this paper in reading the various critical notes under C. setiloba. 



