Vol. 32 



No. 6 



BULLETIN 



OF THE 



TORREY BOTANICAL CLUB 



JUNE, 1905 



Hepaticae of Puerto Rico 



V. CERATOLEJEUNEA 



Alexander W. Evans 



(With plates 19 and 20} 



Ceratolejetinea is one of the most natural genera of the Lejeu- 

 neae, and its distinctive characters were appreciated long before it 

 was formally recognized as a genus. Apparently the West Indian 

 C, cornuta (Lindenb.) Schiffn. ^ is the species which first appears 

 in the literature. This was originally described as 2l Jungerjnannia f 

 but a few years afterwards was referred to the genus Lejeunea by 

 Nees von Esenbeck.J Meanwhile Dumortier had placed it in his 

 newly proposed genus Colura, § of which the type species was 

 Jwigermannia calyptrifolia Hook. The two species are totally dis- 

 tinct in their vegetative structure, having little in common except 

 their horned perianths, and even in these there are structural differ- 

 ences of importance. In spite of these facts, they are still kept 

 together in the Synopsis Hepaticarum under the section Ceratanthae 

 of the genus Lejeunea.\\ The authors, however, divide this section 

 into two subgroups, Genumae and Aberrantes, The first of these 

 corresponds exactly with the genus Ceratolejeimea, as now under- 

 stood by most writers, and includes C. cornuta and about fifteen oi 

 its Immediate allies. The second is a much more artificial group 



*Bot. Jahrb. 23 : 583. 1897. 



t Lindenberg, Nova Acta Acad. Caes. Leop. -Carol. 14, suppl.: 23. 1S29. 



JNaturg. der europ. Leberm. 3 : 265. 1838. 



\ Recueil d'Obs. sur les Jung. 12. 1835. 



Z. c. 399. 1845. 

 [The Bulletin for May (32': 22^-2-] 2. pi. g-i8) was issued 27 My 1905.] 



273 



