NOTEWORTHY LEJEUNEAE FROM FLORIDA I4I 
0.5 X 0.4 mm. This size is rarely attained in the Porto Rican speci- 
mens, and then only in the vicinity of perianths. Most of the leaves 
are only 0.3-0.35 mm. in length by 0.3 mm. or less in width. Similar 
but less constant discrepancies are to be found in the perianths. 
One interesting peculiarity of the perichaetial bracteoles should be 
alluded to. Although their lateral margins may be entire or nearly so, 
as the original description perhaps implies, it is more usual for them 
to be irregularly toothed, and in many cases a single large tooth on 
each side can be demonstrated. 
The close relationship between R. Maxonii, R. phyllobola (Nees & 
Mont.) Evans and R. Brittoniae Evans was emphasized in the original 
publication of the species, and the differential characters were there 
contrasted. The dioicous inflorescence will at once distinguish R. 
Maxonii from the autoicous R. phyllobola. From R. Brittoniae, which 
is likewise dioicous, the best differential characters are drawn from the 
androecia. In R. Brittoniae these bear bracteoles along their entire 
length; in R. Maxonii at the base only. In the absence of androecia, 
the smaller size and paler color of R. Maxonii will usually serve to 
distinguish it. 
5. Euosmolejeunea parvula sp. nov. 
Pale or dull green, sometimes becoming brownish with age, scat- 
tered or growing in loose mats; stems mostly 0.06-0.08 mm. in 
diameter, copiously and irregularly branched, the branches widely 
spreading and often subdivided, not microphyllous : leaves imbri- 
cated, the lobe obliquely to widely spreading, plane or slightly 
convex, falcate, broadly ovate, mostly 0.25-0.35 mm. long and 
0.2-0.3 mm. wide, dorsal margin arching partially or wholly across 
the axis, sometimes straight at base but usually strongly outwardly 
curved from the base to the broad and rounded apex, ventral margin 
straight or slightly outwardly curved, forming a straight line or 
a very obtuse angle with the keel, margin entire throughout; 
lobule inflated throughout, ovoid, about o.i mm. long and 0.07 mm. 
wide, keel straight to somewhat arched, roughened from projecting 
cells, free margin strongly involute to beyond the apex, sinus oblique 
and shallow, apical tooth a single, blunt, projecting cell with a hyaline 
papilla in a slight depression at its distal base; cells of lobe about 12 fx 
in diameter at the margin and 20 x 16 )U in the median and basal por- 
tions, thin-walled but usually with minute trigones, cuticle smooth; 
ocelli none: underleaves distant to contiguous, broadly ovate to 
orbicular, when well developed mostly 0.12-0. 16 mm. long and 0.12- 
0.14 mm. wide, bifid about one half with a sharp and often narrow 
sinus and erect triangular lobes, obtuse to subacute at the apex, 
