278 Evans : Hepaticae of Puerto Rico 



leaf-cell to give rise directly to a leafy shoot or propagulum with- 

 out the interpolation of a protonemal structure. This takes place 

 more readily in a leaf which has become detached but sometimes 

 occurs in an intact leaf Propagula of this type are homologous 

 with those described for PlagiocJiila, 



Five species of Ceratolejeitnea have been recorded from Puerto 

 Rico. Three of these are mentioned in Hampe and Gottsche's 

 hst of Schwanecke's hepatics ; namely, Z. ceratantha, L, patentis- 

 sima and L, variabilis.^ The specimens referred to Z. ceratantha 

 have been examined by Stephani and also by Schiffner. Stephani 



w 



makes them the type of his new Ceratohjcunca Schzvaneckei ; 

 Schiffner finds in them a mixture of two species, the one indeter- 

 minable and the other referable to Z. variabilis, ^ There is no 

 very good evidence, therefore, that Z. ceratantha has been really 

 found on the island. In the paper on Puerto Rico hepatics pub- 

 lished many years later by Stephani, two other species, Z. cornuta 

 and Z. spinosa are added from the collections of Sintenis,J but the 

 specimens referred to Z. cormtta were afterwards described as Cera- 

 tolejciiuea Sintenisii Steph. Z. cornuta^ therefore, should also be 

 considered a doubtful member of the flora. In the collections 

 made by the writer on El Yunque, both C, spinosa and C> 

 Schwancckei occur in abundance, and there are also specimens of 

 a third species which is apparently undescribed. Heller's speci- 

 mens of this genus are mostly sterile but add a few fragments of 

 what seems to be Z. {Ceratolejctinea^ brevinervis Spruce, Seven 

 species, therefore, are known with more or less certainty from 

 the island, and it is probable that several others remain to be 

 discovered. 



Ceratolejeunea spinosa (Gottsche) Steph. 

 Lcjeunea spinosa Gottsche ; G. L. & N. Syn. Hep. 402. 1845. 



sp 



i877-. 



Lcjeunea {Cerato-Lejeiined) spinosa Spruce, Hep. Amaz. et 

 And. 211. 1884 (excluding specimens described). 



spinosa 



238. 1895. 



Dark olive-green or brownish, growing in depressed tufts ; 

 stems 0.17 mm. in diameter, prostrate and loosely adherent tojbe 



^ ^^^■^^^^^^^^■*^*^^^^^^^-^^^^^**^i^^^^^^^^^^i^"'-^^% -^ ^ 



^ Linnoea 25 : 355, 356. 1852. 

 f Bot. Jahrb. 23 r 582. 1897. 

 % Hedwigia 27 : 285, 291. 1888. 



