COLOLEJEUNEA BIDDLECOMIAE 169 
Pale or bright green, scattered or depressed-caespitose : stems 
prostrate, 0.04 mm. in diameter, irregularly pinnately branched : 
rhizoids somewhat abundant: leaves distant to imbricated, the lobe 
obliquely to widely spreading, plane or usually convex, ovate, 0.35 
mm. long, 0.2 mm. wide, apex varying from rounded to acute, 
usually obtuse, margin crenulate or denticulate from projecting 
cells, antical margin arching just across axis, slightly rounded at 
the very short base, postical margin almost straight, forming a con- 
tinuous line with keel: lobule inflated, at least near keel, ovoid to 
globose, 0.17 mm. long, 0.15 mm. wide, keel strongly arched, free 
margin curved, involute about half its length, bearing an obtuse or 
rounded, sometimes indistinct tooth just beyond the middle, then 
obliquely truncate to end of keel, with a tooth usually composed 
of two rounded cells midway between the blunt tooth and the end 
of keel; stylus mostly conspicuous, usually composed of two to 
ten cells in a single row, sometimes two cells broad a part of its 
length, in rare cases reduced to a single papilla; cells of lobe thin- 
walled, usually with minute trigones, averaging 10 p in diameter at 
edge of lobe, 13 بر‎ in the middle and 21 X 13 p at base, walls on 
outer surface of lobe convex to conical, sometimes with a distinct 
thickening or wart in the middle; cells of lobule plane: inflores- 
cence dioicous or autoicous: 2 inflorescence borne on a leading 
branch, innovating on one side; bracts unequally bifid, the lobe 
obliquely spreading, broadly ovate, 0.35 mm. long, 0.2 mm. wide, 
obtuse to acute at the apex, lobule orbicular, 0.17 mm. long, 
margin denticulate and outer surfaces of both lobe and lobule pa- 
pillose from projecting cells; perianth partly exserted, obovoid to 
oblong, 0.6 mm. long, 0.35 mm. wide, not compressed, rounded to 
truncate at the apex, with a short beak, sharply five-keeled in 
upper part, surface roughened from projecting cells except near 
the base: 3 spikes usually borne on leading branches ; bracts in 
two to five pairs, imbricated, similar to the leaves, but with a pro- 
portionately larger lobule ; antheridia borne singly or in pairs. 
Type-locality, Canada (Macoun). 
On trees or rocks : Ontario (Macoun, Dearness); Massachusetts 
(Stone) ; Connecticut (Eaton, Underwood, Evans) ; New York 
(Underwood); New Jersey (Rau); District of Columbia (Coville, 
Maxon); Ohio (Miss Biddlecome, Beardslee, Wilcox, Werner) ; 
Florida (Miss Biddlecome) ; Alabama (Sullivant). 
Exsic.: Musc. Alleg. 275 (as Zejeunea calcarea). Hep. Bor.- 
Amer. gg (as Lejeunca echinata). Hep. Amer. 51 (as Lejeunea 
(Colo-Lej.) calcarea. Can. Hep. 13 (as Lejeunea calcarea). 
Cololejeunea Biddlecomiae is closely related to the European 
