Evans: A NEW LEJEUNEA 527 
Britton & Marble 1251, 1254, 1255; on stones, Crown, February, 
1913, Britton & Marble 1365. 
No. 1365 from St. Thomas may be designated the type; a 
slight admixture of L. pililoba Spruce is present. 
In the genus Lejeunea the lobule when typically developed 
consists of an inflated sac, ovate in outline, more or less involute 
along the free margin, and tipped by a single projecting cell with a 
hyaline papilla at its proximal base. The same general type of — 
lobule is found in several other genera of the Lejeuneae, such as 
Rectolejeunea, Ceratolejeunea, and Crossotolejeunea. Unfortu- 
nately, in certain species of Lejeunea, the lobule often fails to show 
its typical structure and appears reduced in size or otherwise 
variously modified. In some cases a prolonged search may be 
necessary before inflated lobules can be demonstrated at all, and 
it is not unusual for poorly developed lobules to be associated with 
plants bearing perianths. In the species here proposed as new no 
inflated lobules whatever have been seen, although many plants, 
both with and without perianths, have been examined. The 
lobule in all cases observed has been in the form of a minute basal 
fold, consisting of only a few cells. It seems safe to assume, 
therefore, that lobules of this reduced type represent a constant 
feature of the species. 
With respect to size, the leaves, perichaetial bracts and per- 
ianths of L. minutiloba exhibit a considerable range of variation, 
and on slender stems and branches the leaves may be scarcely 
half as large as on robust stems. The small bracts and perianths 
_ are associated especially with short female branches, the size 
varying approximately with the length of the branch. The small- 
est bracts and perianths, therefore, are usually to be found on 
branches which bear a single vegetative leaf in addition to the 
bracts. The underleaves and bracteoles are much less subject 
to variation in size than the leaves and bracts; they vary markedly, 
however, in the character of their apices. -These are sometimes 
acute or even apiculate, sometimes obtuse, and sometimes broadly 
rounded. 
Among related species it will be sufficient to mention L. 
floridana Evans and L. glaucescens Gottsche. The first is still 
known from Florida only, but the second is widely distributed in 
