536 
The Ohio Naturalist. 
[Vol. VI, No. 7, 
Liochlaena Nees. 
Monoecious. Dark Green, Stem with brownish rootlets, closely 
creeping, usually branched many times; leaves imbricate, 
mostly decurrent; leaf cells large, roundish, with much thick- 
ened walls; involucral leaves vertical and saccate in their 
lower part, recurved and spread out flatly in their upper part. 
lanccolata Nees. 
Lophocolea Dumcrt. 
1. Leaves entire, emarginate and bidentate (often on the same stem), 
leaves '2-lobed, globes. mo re or less dentate. heteropylla Nees. 
Underleaves (all) distinctly bilobed. 2. 
2. Under-leaves .3 to 4 cleft or 2 and 3 to 4 parted. 3. 
Underleav^es 2-lobed. 4. 
.3. Underleaves 3 to 4 cleft, the inner lobes lanceolate, the outer ones 
linear; leaves acutely lobed. bidcntata Dumort. 
Underleaves, the lower small, 2-parted, the upper larger with a 
signle tooth on each side or palmately 3—1 parted and the 
apical sublanceolate and narrowly bifid; leaves mostly ob- 
tusely lobed. Hallii Aust. 
4. Leaves 2-lobed with obtuse sinus and lobes or retuse or entire; 
underleaves light-pink, the steaceous lobes spreading incruved. 
Maconnii Aust. 
Leaves 2-lobed with acute lobes and acute or obtuse sinus. 5. 
5. Leaf lobes with an obtuse (lunate) sinus, usually bearing yellowish 
globules, lobes of underleaves lanceolate, acuminate. Dioe- 
cious. yninor Nees. 
Leaf lobes usually with an acute sinus; lobes of underleaves subu- 
late. Monoecious. Aiistini Lindb. 
Lumilaria Micheli. 
Thallus oblong with rounded lobes, aereolate and porcse, innova- 
ting from the apex, with imbricate sublunate scales beneath; 
peduncle very hairy; antheridia in the apical sinus of the 
thallus. vulgaris Raddi. 
Marchantia Marchant f. 
Thallus large, forking, areclate, porcse; receptacle divided into 
an uneven number of rays (mostly 9) and the involucres be- 
tween them always one less in number. Antheridia immersed 
in a peduncled, disk-like, raidate, or lobed receptacle. Dioe- 
cious. polymorpha L. 
Marsupella Dumort. 
1. Leaves closely and vertically imbricate; stem minute (2—4 mm.), 
clavate with 4—8 pairs of oval leaves; leaves bilobed, lobes 
acute with an acute or angular sinus. adiista Spruce. 
Leaves spreading or locseh' imbricate. 2, 
2. Stem stoloniferous, rigid (10-40, sometimes 80-100 mm.), some- 
what thickened upward; leaves usually broader than long, 
subquadrate, lobes obtuse or mucronate; sinus obtuse (^ or 
4 of the leaf) ; the two upper involucral leaves connate to 
the middle. emarginata Dumort. 
Stem not stoloniferous, erect, subflexuous (1.5-30 mm.); leaves 
obovate, their upper half slightly keeled, their lower half 
ventricose-concave ; lobes roundish— obtuse, sinus narrow, 
acute or less obtuse than in the perceding (1 of the leaf) ; 
the two upper involucral leaves connate J. 
sphacclata Dumort. 
Aletzgeria Raddi. 
1. Densely villous throughout. pubesceus Raddi. 
Hairy on the margin and midrib beneath, smooth above. 2. 
