Evans: HEPATICAE OF PUERTO RICO 259° 
almost impossible to draw sharp distinctions between them, and 
they rival each other in variability. According to Montagne 
there are three differences which ought to be especially emphasized. 
In C. myriocarpa he states that the lobule is distinctly shorter 
than the lobe, that the perichaetial bracts are shorter than the 
perianth and entire at the apex, and that the mature capsule is 
oval. In C. minutissima, on the other hand, he states that the 
lobule is about as long as the lobe, that the bracts nearly equal 
the perianth in length and are distinctly indented at the apex, 
and that the capsule is spherical. Of course the third difference 
is based on a misconception. Throughout the Lejeuneae the 
capsule is spherical, and the oval appearance which it shows after 
dehiscence (PLATE 12, FIGURE 1) is simply due to the fact that the 
valves do not quite resume their original position. The other 
differences given by Montagne are fairly constant, but the dis- 
tinction between the bracts might be brought out a little more 
clearly by saying that the lobule in C. minutissima is usually 
definite, the keel being sharp, whereas in C. myriocarpa it is 
usually poorly defined, the keel being rounded or obsolete. It 
may also be added that the leaf lobes in C. minutissima are nearly 
rotund, while in C. myriocarpa they are more elongated. There 
are still other differences in the gemmae, which will be discussed 
later on. Whether the true C. minutissima occurs in the West 
Indies is uncertain. It is frequent in southern and western Europe 
and is also found, in North America, in the Gulf States and along 
the Atlantic as far north as South Carolina. It has likewise been 
collected in Bermuda. Its discovery in the Bahamas or in Cuba 
would therefore not be surprising. 
COLOLEJEUNEA DIAPHANA Evans 
Cololejeunea diaphana Evans, Bull. Torrey Club 32: 184. pl. 5. 
f. 9-14. 1905. 
On leaves of a tree. Three miles east of Santurce, Heller 
(464). The type specimens grew on bark in southern Florida 
and were collected by Small and Carter. No other stations for 
the species are known. 
The specimens from Puerto Rico are very scanty and are 
referred to C. diaphana with considerable hesitation. They are 
