258 Evans: HEPATICAE OF PuERTO RICO 
(type of L. epiphyta); from St. Vincent, Elliott (type of L. hetero- 
morpha); from Jamaica, Evans; and from Mexico, Karsten. The 
Jamaican specimens grew on rocks but the others were apparently 
all found on trees. The type specimen of L. myriocarpa is pre- 
served in the Montagne herbarium at the Jardin des Plantes, 
Paris, and that of L. heteromorpha in the herbarium of the British 
Museum, where the Mexican specimens of L. myriocarpa are also 
to be found. The writer has examined these three specimens and 
finds that they evidently represent the same species and that they 
agree closely with the plants from Puerto Rico and Jamaica and 
also with those in Wright’s distribution. The specimen of L. 
epiphyta in the Lindenberg herbarium at Vienna was studied by 
Stephani and referred by him to L. myriocarpa. No other stations 
for the species can be safely quoted at the present time. 
It is very difficult to assign definite characters to Cololejeunea 
myriocarpa because the species is not only extremely variable but 
often presents the appearance of being incompletely or abnormally 
developed. This is especially true of the lobule, which usually 
yields characters of great importance in the Lejeuneae. In C. 
myriocarpa there is often nothing more than a mere fold along 
the postical side of the lobe to represent the lobule, and the keel 
is sometimes so nearly obliterated that both lobe and lobule are 
practically in one plane. It is only in the rarest instances that a 
lobule is found which represents a structure more typical of the 
genus. In these cases the keel is sharper and a distinct apical 
tooth, consisting of two superimposed cells, is developed. Even 
here, however, the proximal tooth is scarcely apparent. The 
variability which is so manifest in the foliage leaves affects also 
the perigonial and perichaetial bracts and, to a less extent, the 
perianth. The cylindrical stipe which develops at the base of 
this organ after fertilization is largely responsible for the variation 
in form which it shows. In extreme cases the stipe may equal or 
exceed the perianth itself and carry it far beyond the bracts, and 
this condition is connected by intergradations with perianths in 
which no stipe whatever is formed. 
The close relationship which exists between C. myriocarpa and 
C. minutissima (Sm.) Schiffn. was fully recognized by Montagne. 
The two species share so many characters in common that it is 
the et aa i ie 
EM Sach irate st itis ed 
