202 Evans: HEpATICAE OF PUERTO RICO 
developed ; bracteole ovate, 0.35 mm. long, 0.25 mm. wide, bifid 
one third to one half with acute, erect lobes and narrow sinus; 
perianth projecting slightly beyond the bracts, triangular-obovate 
in outline, 0.75 mm. long, 0.5 mm. wide, antical face plane, pos- 
tical keel low and broad, apex emarginate and with a very indis- 
tinct beak, lateral keels sharp, extended upward as rounded 
auricles, lateral wings extending to or below the middle of the 
perianth, two to six cells broad, denticulate or serrulate on the 
margin from projecting cells, surface of perianth smooth or some- 
what roughened near wings: < inflorescence terminal or occupy- 
ing a shorter or longer branch; bracts in about six pairs, some- 
times more numerous: mature sporophyte not seen (PLATE 9, 
FIGURES 17—23). 
On living leaves. El Yunque, Avans (27 p. p.). Also collected 
by Schwanecke. Other stations for the species are the following : 
St. Kitts, Breutel, the type-locality ; Guadeloupe, Husnot ; Dominica 
and St. Vincent, A//oft ; Peruvian Andes, Spruce ; Bolivia, Rusby. 
The identity of Lejeunea leptocardia with C. accedens was pro- 
visionally acknowledged by Spruce when he distributed his exsic- 
catae, and was afterward affirmed more positively by Stephani.” 
There is certainly no essential difference between the specimens in 
the Hepaticae Spruceanae and those collected on El Yunque. 
The generic position of the species is a little uncertain, because it 
approaches Prionolejeunea so closely, as has already been noted. 
It is here separated from Prionolejeunea and placed in Cyclolejeunea 
on account of its prostrate habit, the rounded lobes of its leaves, 
the different cell-structure, the longer female branch and the mar- 
ginal discoid gemmae. 
The cell-walls of C. accedens are so transparent that it is some- 
times difficult to demonstrate the tubercles on the leaf-cells except 
along the margin. In doubtful cases staining with methyl-blue 
will show whether they are present or not. The occurrence of 
these tubercles is of course a somewhat aberrant character for the 
genus and would be equally aberrant for either Prionolezeunea ot 
Odontolejeunea ; it indicates a certain relationship with Zrachyle- 
Jeunea, to which, however, C. accedens cannot belong on account 
of its flattened, emarginate perianth. 
There is no Puerto Rico species except the following with 
which C. accedens is likely to be confused. From C. convexistipa, 
* Hedwigia, 35: £20. 1896. 
