256 Evans: HEPATICAE OF PUERTO RICO 
may develop into a slender filiform process from two to ten cells 
long and sometimes two cells wide throughout more or less of its 
extent. This is the case, for example, in both C. calcarea and C. 
Biddlecomiae. The stylus apparently reaches its highest develop- 
ment in Lejeunea (Colo-Lejeunea) pseudostipulata Schiftn.,* of New 
Guinea, where it forms a broad leaflike appendage, comparable 
with the stylus found in certain species of Frullania. 
The inflorescence is autoicous in the majority of the species, 
but is dioicousin a few. The archegonium is borne on amore or . 
less elongated branch, and the female flower is invariably sub- 
tended by one or two innovations. The bracts spread less widely 
than the leaves, and their lobes are usually smaller and narrower. 
The lobules are plane and differ more or less from the lobules of the 
leaves in their apical and marginal teeth. The perianth is typic- 
ally obovoid and abruptly contracted into a short beak. The five 
keels are sometimes restricted to the apical region and sometimes 
extend to below the middle. The cells are similar to the leaf cells 
but often project in a more conspicuous way especially along the 
keels. In the male inflorescence the lobules of the bracts are usually 
larger than in the leaves and are sometimes as large as the lobes. 
The antheridia are borne singly or in pairs, both conditions being 
occasionally found in the same species. 
The sporophyte is of the type seen in the majority of the Le- 
jeuneae. The small spherical capsule is borne on a short stalk, 
which has at its base a slightly developed foot. The valves of the 
capsule are only one cell thick and the cell walls are thickened 
irregularly. Even the truncate elaters lack the spiral thicken- 
ings which are found in most genera, and show irregular thicken- 
ings only. The spores are green and variable in form, some being 
much longer than others. Their walls are slightly thickened and 
minutely verruculose. 
No species of Cololejeunea in its restricted sense have been 
recorded from Puerto Rico. Two species, however, occur in the 
collections studied by the writer. 
Cololejeunea myriocarpa (Nees & Mont.) 
Lejeunea myriocarpa Nees & Mont. in Ramon de la Sagra, Hist. 
Fis. Pol. y Natur. Cuba 9: 473. 1845. 
* Leberm. der ‘‘Gazelle’’ Exped. 33. pl. 7. f. 9-11. 18090. 
Me ee ee 
