546 Evans: HeEpaTICAE OF PUERTO RICO 
pairs. In some cases the two lobes are subequal ; in other cases 
the lobe is distinctly larger than the lobule. In the paroicous M. 
robusta (Mitt.) Schiffn., Spruce notes that antheridia are occa- 
sionally developed in the axils of the perichaetial bracts. 
At the present time the only species of Marchesinia known from 
Puerto Rico is the variable and widely distributed J brachiata, 
and even this species has not been previously recorded from the 
island. It may be described as follows: 
MARCHESINIA BRACHIATA (Swartz) Schiffn. 
Jungermannia brachiata Swartz, Prodr. Fl. Ind. Occ. 144. 1788. 
Lejeunea Bongardiana Lehm. & Lindenb. ; Lehmann, Pug. Plant. 
e 40. 1838: 
Phragmicoma Guilleminiana Nees & Mont. Ann. Sci. Nat. Bot. II. 
16: 128. 1841. 
Lejeunea brachiata Nees; G. L. & N. Syn. Hep. 313. 1845. 
Lejeunea complicata Hampe, /. c. 321. 1845. 
Phragmicoma Bongardiana Lindenb. /. c. 740. 1847. 
Symbiezidium brachiatum Trevis. Mem. Ist. Lomb. III. 4: 493- 
1877. 
Marchesinia Guilleminiana Trevis. /. c. 405. 1877. 
Marchesinia Bongardiana Trevis. 1. c. 405. 1877. 
Lejeunea (Homalo-Lejeunea) Guilleminiana Spruce, Hep. Amaz. ¢ 
And. 134. 1884. 
Lejeunea (Homalo-Lejeunea) Bongardiana Spruce, /. ¢c. 135. 1834. 
geeR (Homalo-Lejeunea) brachiata Steph. Hedwigia 29: 14 
1890. 
Marchesinia brachiata Schifin. ; Engler & Prantl, Nat. Pflanzenfam. 
a5 o 828s 85m: 
Olive- or purplish-green, glossy, scattered or growing in loose 
tufts : secondary stems 0.35 mm. in diameter, ‘at first pendent but 
eventually spreading at the tips, sparingly pinnate or, on female 
plants, falsely dichotomous, the branches similar to the stem, not 
microphyllous but sometimes with smaller leaves: leaves loosely 
imbricated, the lobe widely spreading, scarcely falcate, ovate, 7 
mm. long, 1.2 mm. wide, slightly convex especially along : 
postical margin and sometimes revolute at the apex, rounded oF 
subcordate at the base and arching across or a little beyond oe 
axis, antical margin slightly outwardly curved to apex, postical 
