542 Evans: HEpaTICAE OF PuERTO RICO 
and also with Marie’s type specimens of Leyeunca incrassata. All 
of these various plants agree closely with one another and evidently 
belong to the same species. 
S. barbiflorum is a smaller plant than S. ¢ransversale, the lobes 
of its leaves are less falcate and plane or nearly so along the 
postical side, and its underleaves are constantly long-decurrent. 
It is further distinguished by its autoicous inflorescence and by the 
scattered laciniae on the postical surface of the perianth. In rare 
cases these laciniae are few in number or even absent altogether, 
and a smooth or nearly smooth perianth is the result. These 
smooth perianths, however, present every appearance of being 
poorly developed, and since they are usually found on plants which 
bear normal perianths as well, they will rarely be a source of con- 
fusion. In all the involucres examined the bracteole has been 
distinctly bifid, and it is possible that this character may also be 
relied upon in distinguishing the species from its allies. 
SYMBIEZIDIUM VINCENTINUM (Gottsche) Trevis. 
Lejeunea vincentina Gottsche; G. L. & N. Syn. Hep. 313. 1845. 
Symbiesidium vincentinum Trevis. Mem. Ist. Lomb. III. 4: 493: 
vee 
Lejeunea (Platy-Lejeunea) vincentina Spruce, Hep. Amaz. et And. 
£27, 188 
Platylejeunea vincentina Schiftn. ; Erfgler & Prantl, Nat. Pflanzen- 
fam. 1°: 131. 1895. 
Puerto Rico, without definite locality, Sintenis (6g). The tyPe 
locality of the species is the island of St. Vincent, but the original 
collector is not mentioned by Gottsche. The following stations 
have also been recorded : Guadeloupe, Husnot ; Dominica, Eliott ; 
Colombia, Moritz ; Brazil, Schenck ; Ecuador, Spruce. The species 
has also been collected in Jamaica by Maxon, but no specimens 
from Puerto Rico have been seen by the writer. 
S. vincentinum agrees with S. darbiflorum in its autoicous in- 
florescence, Its - leaves, however, although usually rounded at 
the apex, are occasionally apiculate or shortly acute, a peculiarity 
which is emphasized by both Gottsche and Spruce. The under 
leaves are somewhat broader than in S. barbiflorum, tending to be 
reniform in outline, but they agree in being decurrent. The 
