LEJEUNEA AMERICANA 155 
usually acute or apiculate, occasionally obtuse, rarely rounded, 
sinus acute to obtuse, margin entire or irregularly sinuate, rarely 
with an indistinct, blunt tooth at about the middle of one or both 
sides: inflorescence autoicous: $ inflorescence sometimes on a 
leading branch, sometimes on a short branch, innovating on one or 
rarely on both sides, the innovations often floriferous, bracts com- 
plicate, unequally bifid, the lobe obliquely spreading, varying from 
oblong to obovate, rounded to subacute at the apex, 0.6 mm. long, 
0.3 mm. wide, lobule mostly oblong and rounded or truncate at the 
apex, rarely indistinctly toothed or lobed with rounded divisions, 
0.35 mm. long, 0.18 mm. wide; bracteole free, ovate, 0.55 mm. 
long, 0.35 mm. wide, somewhat narrowed at base, bifid about one 
half with erect, obtuse to acute divisions and narrow sinus ; perianth 
obovoid, often distinctly dilated above middle, 0.7 mm. long, 0.35 
mm. wide, gradually narrowed toward base, broad and truncate 
above, and with a short beak, terete below, sharply five-keeled in 
upper part, the keels smooth sometimes showing vague traces of 
wings : 3 inflorescence usually occupying a Short branch, rarely 
borne on a longer branch, bracts in two to eight pairs, similar to 
those of Z. patens : spores greenish, angular, thick-walled, minutely 
verruculose, averaging 14 # in short diameter. 
Type-locality, Southern States (Austin) ? 
On trees. North Carolina (Johnson); South Carolina (Sulli- 
vant, Miss DuBois); Georgia (Small); Florida (Farlow, J. D. 
Smith, Underwood, Straub); Alabama (Underwood) ; Mississippi 
(Langlois, Lloyd and Tracy); Louisiana (Drumm ond, Langlois) ; 
Texas (Hall). Also known from various parts of tropical Amer- 
ica. 
Exsıc.: Musc. Amer. St. Merid. 171 f. f. (as Jungermannia ser- 
Pyllifolia). Musc. Alleg. 272 (as Lejeunea serpyllifolia). Hep. 
Bor.-Amer. 97 f. p. (as Lejeunea cavifolia). Hep. Amer. 98 (as 
Lejeunea (Micro-Lej.) Austin). Hep. Amer. 7 (as 6 
(Micro- Lej.) lucens). 
In proposing the present species as a variety of Lejeunea ser- 
pyllifolia Lib., Lindberg referred to it all the American speci- 
mens in his herbarium which presumably belonged to that species. 
His dictum has been followed, almost without exception, by sub- 
sequent writers on American hepaticae, who have apparently taken 
it for granted that typical /. serpyllifolia Lib. did not occur in 
America. Judging, however, from the specimens which Lindberg 
quotes, his variety was an aggregate, made up of L. Americana, as 
