—53— 



composed of only one or two cells. The hyaline papilla, finally, is situated at 

 the tip of this tooth instead of near the base. Although lobules of the kind 

 just described seem to be new to the present genus, somewhat similar lobules 

 are known in certain species of Leptocolea and Lejeunea and represent equally 

 marked deviations from the type of lobule characteristic of these genera. In 

 the African Leptocolea cuneifolia (Steph.) Evans, for example, the apical tooth 

 consists of a long row of cells tipped with a hyaline papilla, but this tooth is 

 associated with a lobule which is inflated and otherwise normal in structure. 

 In Lejeunea pililoha Spruce, of Florida and the West Indies, the lobule agrees 

 still more closely with that of the new Cololejeunea. It consists of a small basal 

 fold bearing a very long filiform tooth with a hyaline papilla at its tip. Broader 

 apical teeth with terminal papillae are known in Leptocolea planifolia Evans, of 

 Porto Rico, and in' its immediate allies, as well as in Lejeunea spiniloha Lindenb. 

 & Gottsche, of tropical North America, a species to which the writer has recently 

 called attention.^ In the species of Leptocolea with these broad apical teeth, 

 the lobules not only diverge widely from the condition normal to the genus, but 

 are inconstant in their characters. In describing their peculiarities the sugges- 

 tion was made that they might simply represent an abnormal development and 

 that normally developed lobules might conform- more closely to the type char- 

 acteristic of the genus. The study of Cololejeunea setiloha leads to a similar 

 hypothesis. The lobules present every appearance of being poorly or abnorm- 

 ally developed, and it is quite possible that the discovery of normally developed 

 lobules might necessitate a revision of some of the characters assigned to the 

 species. The great frequency of poorly developed lobules in other members of 

 the genus, such as C. minutissima and C. myriocarpa (Nees & Mont.) Evans, 

 lends further support to this idea, and the same thing may be said of the large 

 and broad lobules found on the perichaetial and perigonial bracts. At the same 

 time a careful examination of Mr. Rapp's material has failed to demonstrate 

 any lobules unlike those described. 



Leaving the lobules out of consideration C. setiloha shows much in common 

 with C. minutissima, a widely distributed species in Europe, Bermuda, and the 

 southern United States. The two species agree in inflorescence, in the structure 

 of the perianth, and in the thin- walled cells. In C. setiloha, however, the lobes 

 of the leaves are larger, relatively narrower, and usually more distinctly tapering 

 toward the apex. In C. Biddlecomiae, the commonest species in the United 

 States, the inflated lobules, the papillate lobes and perianths, and the long stylus 

 afford striking distinctive characters. In C diaphana, known only from Florida 

 and Porto Rico, inflated lobules are occasionally produced, but in the absence 

 of these structures the narrower and miore pointed lobes, the more or less elongated 

 leaf cells, and the solitary antheridia will serve to distinguish the species. 



Gemmae are abundantly produced by C. setiloha and show, both in develop- 

 ment and in structure, the features characteristic of the genus. Unfortunately 

 they are not always well developed, but a typical gemma is shown in Fig. 7. It 



1 Bryologist 15 : 61. 1912. 



