606 Evans: NEw WEst INDIAN LEJEUNEAE 
will separate D. Johnsonii from D. pellucida, which latter, more- 
over, almost invariably grows on leaves. 
Leptocolea appressa sp. nov. 
Pale green, growing in closely appressed mats: stems 0.05 mm. 
in diameter, sparingly and irregularly pinnate, the branches ob- 
liquely spreading, similar to the stem but with somewhat smaller 
leaves: stem leaves imbricated, the lobe widely spreading, falcate, 
ovate-oblong, 0.5-0.6 mm. long, 0.3-0.4 mm. wide, broad and 
rounded at the apex, antical margin arching considerably beyond® 
the axis, strongly outwardly curved from base to apex, postical 
margin straight or slightly curved, forming a rounded indentation 
with the keel, margin very minutely crenulate from projecting 
verruculae; lobule inflated throughout, ovate, 0.14 mm. long, 
0.08 mm. wide, keel arched, apical tooth consisting of two cells in 
a row, proximal tooth shorter, consisting of a sharp or blunt pro- 
jecting cell, teeth separated by a very narrow sinus containing a 
marginal hyaline papilla; stylus (at base of lobule) consisting of a 
papilla; cells of lobe averaging 5u at the margin, 9 X 7y in the 
middle, and 20 X 7u at the base, wall more or less uniformly 
thickened but without distinct trigones except in median and basal 
regions, each cell bearing a median verrucula on the free outer wall 
except in the basal portion of the leaf; ocelli usually four, arranged 
in a short median row and averaging about 35 X 23u: inflorescence 
autoicous (but many plants apparently unisexual): 9 inflorescence 
borne on a more or less elongated branch, innovating on one side, 
the innovation usually short and sterile; bracts obliquely spread- 
ing, complicate, keel sharp but without a wing, lobe oblong- 
obovate, 0.45 mm. long, 0.25 mm. wide, rounded at the apex, 
margin as in the leaves, ocelli several, forming an elongated patch 
several cells wide, lobule obovate, 0.25 mm. long, 0.2 mm. wide, 
rounded and irregularly dentate at the apex; perianth about one 
fourth exserted, obovate, 0.45 mm. long, 0.4 mm. wide, truncate 
at the apex with a distinct beak, five-keeled in the upper part, 
the lateral keels sharp, antical keel low and short. postical keels 
obtuse but extending almost to the base, lateral keels minutely 
and irregularly denticulate from projecting cells, surface otherwise 
On bark of trees. Jamaica: John Crow Peak, Evans (104), 
