152 LEJEUNEAE OF THE UNITED STATES AND CANADA 
tire or nearly so, antical margin arching across or just beyond axis, 
slightly rounded at base, postical margin usually forming an angle of 
120° or more with keel, angle rarely as small as 90°; lobule strongly 
inflated, ovate, 0.2 mm. long, 0.14 mm. wide, keel strongly arched, 
scarcely or not at all crenulate, free margin more or less curved 
and involute as far as apex, then passing by a shallow lunulate 
sinus to end of keel, apex tipped with a single, blunt, projecting 
cell ; cells of lobe almost plane, thin-walled, trigones and scattered 
intermediate thickenings sometimes distinct, sometimes scarcely 
evident, cells at edge of leaf averaging 17 »# in diameter, in the — 
middle 24 رم‎ at the base 30 x 21 p: underleaves distant, as large m 
as or a little larger than lobule, ovate-orbicular, 0.2 mm. long, 0.18. 
mm. wide, plane or slightly convex postically, gradually narrowed 
toward base and neither decurrent nor rounded, bifid about one 
half with rounded to acute lobes and obtuse to acute sinus, mar- 
gin entire or nearly so: inflorescence autoicous: © inflorescence | 
and sterile, sometimes floriferous ; bracts complicate, unequally 
bifid, the lobe somewhat spreading, narrowly to broadly ovate, | 
rounded to obtuse at the apex, entire, 0.5 mm. long, 0.3 mm wide, - 
bracteole free, oval-obovate, a 
0.4 mm. long, 0.2 mm. wide, bifid one fourth to one third with — 
slender beak, 
keels smooth, becoming blunter with age: d spike as in L. patens- 
; Massachusetts (Stone) ; Connecticut (Eaton, Hall, Evans); 
Britton) ; Pennsylvania (Bar- 
bour); Wisconsin (Cheney) ; Minnesota (Holzinger). Widely distri- 
y reported from Japan. 
Exsic. : Hep. Bor.-Amer. 97 P. p. Hep. Amer. 8 (as Zejeumea 
serpyllifolia). 
Lejeunea cavifolia is the commone 
and cannot always be determined, 
terete below, sharply five-keeled in upper part, the 
st representative of the Le- 
Pag 
zo fs 
E 
: 
۱۵ bins 
