Evans: HEPATICAE OF PuERTO RICO 217 
denticulate along the margin, lobule obtuse, sparingly denticulate; 
bracteole oblong-obovate, 0.5 mm. long, 0.3 mm. wide, bifid about 
one half with acute suberect divisions, entire or irregularly crenu- 
late from projecting cells; perianth oblong or oblong-ovate, 1.2 
mm. long, 0.5 mm. wide, rounded to truncate at the apex and with 
avery short beak: inflorescence occupying a short branch, very 
rarely proliferating; bracts imbricated, in from two to four pairs, 
similar to those of D. pellucida; bracteoles also similar: mature 
Sporophyte not seen. (PLATE 16, FIGURES 10-18.) 
On bark of trees. Puerto Rico: El Yunque, Evans (24, 127 
in part). Jamaica: Cinchona, Evans (138, 250 in part). No. 24 
may be designated the type. 
This new species is closely related to D. pellucida but is at 
once distinguished by its larger size and by its autoicous inflores- 
cence. The leaves, furthermore, always lack the hyaline border, 
which is so frequent in D, pellucida, and are never closely appressed 
to the substratum: in fact, they are oftentimes distinctly squar- 
Tose in the antical region. In other respects they are much alike 
in the two species. The underleaves yield a few additional points 
of distinction. In D. pellucida the divisions are acuminate and 
Spread so widely that the upper margin of the underleaf is often 
scarcely indented in the middle. In D. brachyclada the divisions 
Spread obliquely and form a distinct angle where they come 
together. Their apices are acute, rather than acuminate, and 
a usually tipped with a single cell; even when tipped with two 
Superimposed cells they taper more abruptly than in D. pellucida. 
Apparently the female inflorescence in D. brachyclada is invariably 
Fé on an abbreviated branch, but the involucral leaves and 
Perlanths show no very striking peculiarities. The antheridial 
Spikes, also, show little tendency to vary in length. In D. pellucida 
th male and female branches are subject to marked variation in 
this respect, 
DIPLASIOLEyEUNEA UNIDENTATA (Lehm. & Lindenb.) Schiffn. 
Ji . ; 
‘germannia unidentata Lehm. & Lindenb. in Lehmann, Pug. 
stoi 6:48. 1834. 
Jeunea unidentata Lehm. & Lindenb. in G. L. & N. Syn. Hep. 
Pay 1845. 
ie (Diplasio-Lejeunea) unidentata Steph. Hedwigia 29: 90. 
