Evans : Hepaticae of Puerto Rico 160 



doubtless due to differences of interpretation. When the antical 

 surface is deeply grooved it produces the effect of two rounded 

 keels, making the total number five or six, according to whether 

 the confluent postical keels are counted as one or two. When the 

 antical face is plane the number of keels would naturally be esti- 



ft 



mated as four. 



The two other species of PtyckocoUus which have been reported 

 from the West Indies are P. torulosns (Lehm. & Lindenb.) Trevis. 

 and Lejeunea [Acrolej tuned) atroviridis Spruce,* both of which are 

 listed by Spruce from the island of St. Vincent, where they were 

 collected by Elliott. The second of these species is known from 

 no other locality, but P. torulosns is known also from Guiana and 

 Brazil. In L. atroviridis the trigones of the leaves are absent or 

 minute and the keels of the perianth are more or less roughened, 

 so that it is possible that it ought to be referred to some other 

 genus. P. toridosus, however, is a typical repres 

 colais. It mav be at once distinguished from P. 



polycarpits 



blunt lobes and lobules of its bracts, by its truncate bracteole and 

 by its seven- to nine-keeled perianth. It is distinct also in the 

 lobules of its leaves, which bear from three to eight teeth along the 

 free margin instead of one or two. 



ARCHILEJEUNEA 



According to Schiffner, the genus Archdcjcunea contained thirty 

 species in 1895, and perhaps a dozen new species have been pro- 

 posed since he made his estimate. If, however, A. pordloidcs 

 (Spruce) SchifTn., the first species described by Spruce, be selected 

 as the type of the genus, certain species have been referred to it 

 which can hardly be considered congeneric with this type species. 



pseudocucullaL 



holostip 



f 



'/ 



Lindenb.) Steph. and its immediate allies, for the reception of which 

 the genus Lcucolejeuma Evans has recently been proposed. It is 



iferta (Meissn.) 



>ph 



* Jour. Linn. Soc. Bot. 30 : 335. //. 20. / S~*°' l8 94- 

 f Bull. Torrey Club 30 : 552. 1903. 



