Evans: HeEpaTicaAE OF Puerto RIco 553 
esting plant is widely distributed in tropical America, and has re- 
cently been found in Puerto Rico; it is almost always mixed with 
other hepatics and is rarely fertile. Although first described by 
Spruce, LZ. holostipa was also known to Gottsche from specimens col- 
lected in Cuba by C. Wright and was distributed in the Hepaticae 
Cubenses under the name “ Lejeunea pseudocucullata G.” Within 
recent years this manuscript species has been described by Stephani 
as an Archilejyeunea and by Schiffner as a Euosmolejeunea, not ap- 
preciating, apparently, that it was synonymous with Leyeunea holo- 
stipa. It is evident that the greatest diversity of opinion exists re- 
garding the systematic position of the species. This is due to certain 
very peculiar characters which it presents, and, as a matter of fact, 
it does not fit naturally into any one of these four divisions of the 
Lejeuneae to which it has been referred. It seems advisable, there- 
fore, to propose a new genus for its reception, a course already 
suggested by Schiffner. The generic characters of this new genus 
and the specific characters of its single known species are as follows : 
Cyrtolejeunea gen. nov. 
Plants small, bright green: stems prostrate, sparingly branched : 
leaves distant to subimbricated, the lobe convex, not widely spread- 
ing, rounded at the apex, entire ; lobule strongly inflated, free mar- 
gin with a long terminal tooth composed of a single cell and bear- 
ing a hyaline papilla in a slight depression at its distal base (¢. ¢., 
at the beginning of the apical sinus): cells of lobe convex : under- 
leaves orbicular, undivided, entire: @ inflorescence on a leading 
branch, innovating on one side; bracts unequally bifid ; bracteole 
shortly bifid; perianth sharply five-keeled and distinctly beaked, 
the keels not produced as horns. (Name from xvetos, curved or 
convex, and Lejeunea.) 
Cyrtolejeunea holostipa (Spruce) 
Lejeunea (Harpa-Lejeunea) holostipa Spruce, Hep. Amaz. et 
And. 171. 1884. 
Lejeunea (Microlejeunea) holostipa Spruce, Jour. Linn. Soc. Bot. 
39: 348. 1894. 
Archilejeunea pseudocucullata Steph. Hedwigia, 34: 61. 1895. 
Lejeunea pseudocucullata Gottsche ; Wright, Hep. Cubenses ; 
Schiffn. Bot. Jahrb. 23: 583. 1897 (as synonym). 
Euosmolejeunea pseudocucullata Schiffn. 1. c. 
