2 Evans : Hepaticae of Puerto Rico 



. * 



lipped upon the extrusion of the capsule at maturity, a condition 

 brought about by rupture and therefore of but slight taxonomic 

 importance. It will be seen that certain of the characters just 

 noted are vague and elastic, and this is especially true of those 

 ascribed to the lobules and to the floral organs. In fact, the 

 description as it stands would apply to certain recognized species 

 of Euosmolejeunea, Pycnolejewiea, or Lejeimca proper. Two later 

 descriptions of the genus have been published, one by Schiffner 

 and the other by the writer, f but these are both abridged from the 

 original description and add no new characters of importance. 



The type species of Cheilolejeimea is somewhat difficult to de- 

 termine. The first species which Spruce mentions is L. conflncns 

 Lindenb.; J the first species which he describes is his new L. 

 {Cheilo-Lejeimea) aneogyna ; the first species which Schiffner lists 

 in raising the group to generic rank is Cheilolejeunea heteroclada 

 (Spruce) Schiffn. Apparently any one of these three species has 

 some claims to be considered the generic type. It seems most 

 logical, however, to assign this honor to the first species which 



Spruce describes, namely to Cheilolejeunea aneogyna (Spruce) 



comb, nov., in spite of the fact that this particular species does 



not happen to be mentioned by Schiffner. 



Among the many species which have been referred to Cheilole- 

 jeunea by various writers, at least three distinct types of lobule are 

 represented. In the first type, which is clearly exhibited by C. 

 aneogyna, the lobule is strongly inflated but is more or less ab- 

 ruptly contracted in the outer part, where a circular opening into 



the water-sac is to be seen (plate I, figure i). The keel is 



arched, and the free margin is involute to beyond the apex and 

 then passes by a shallow sinus to the end of the keel. The apex 

 is tipped with a single cell, at the distal base of which is a hyaline 

 papilla in a slight depression. In C. aneogyna and its immediate 

 allies the apical tooth is long and sharp (figure 4); it lies appressed 

 to the lobe and extends nearly or quite to the end of the keel, 

 playing an important part in the formation of the opening into the 

 water-sac. In other species, however, the tooth is short and 



* Engler & Prantl, Nat. Pflanzenfam. i 3 : 124. 1 893. 

 f Trans. Conn. Acad. 10 : 435. 1900. 

 % G. L. & N. Syn. Hep. 365. 1845. 



