Evans: HEpATICAE OF PuERTO Rico 5 
and bracteole (FiGuRE 1). The inner bract, which is situated on 
the side of the branch away from the axis, is subtended by a short 
and sterile innovation, which rarely bears more than five pairs of 
leaves. The bracts are much smaller than ordinary leaves. They 
are complicate and bifid, with rounded lobes, those of the inner 
bract being subequal in size. The bracteole is free and differs 
from ordinary underleaves in being longer than broad. 
The perianth is strongly compressed and bears a broad and 
rounded postical keel. It is obovate in outline, gradually broad- 
ening out from a narrow base. At the apex the compressed lateral 
keels are dilated into two large auricles, the short beak being in- 
cluded between them at the bottom of a deep depression. The 
surface of the perianth is smooth and the keels develop neither 
teeth nor wings. A somewhat similar type of perianth is found in 
Neurolejeunea, in Odontolejeunea and its immediate allies, and in 
certain species of Cololejeunea. In some of these cases, however, 
the structure is further complicated by the presence of teeth or 
_ spines, ; 
The male spikes in Stictolejewnea are short, and the bracts 
exhibit no striking peculiarities (FIGURE 3). The antheridia occur 
in pairs, and the bracteoles are restricted to the bases of the spikes. 
Vegetative reproduction has not yet been described for the genus. 
At the present time only one species is known from Puerto Rico, 
namely : 
AO STICTOLEJEUNEA SQUAMATA (Willd.) Schiffn. 
Jungermannia squamata Willd. in Weber, Hist. Musc. Hepat. 
Prodr. 33. 1815. 
Phragmicoma ocellulata Nees & Mont. Ann. Sci. Nat. Bot. II. 19: 
259. 1843. 
Lejeunea squamata Nees in G. L. & N. Syn. Hep. 322. 1845. 
Symbiezidium squamatum Trevis. Mem. R. Ist. Lomb. III. 4: 403. 
1877. 
Lejeunea (Sticto-Lejeunea) squamaia Spruce, Hep. Amaz. et And. 
82. 1884. 
Stictolejeunea squamata Schiffn. in Engler & Prantl, Nat. Pflanzen- 
Min 2°: 13%. 4895. 
Rale-green, glossy, becoming brownish with age, growing in 
depressed mats: stems prostrate, 0.2 mm. in diameter, more or 
