— 95 - 
Leaf y stems 1/16 to inch in width, with downward growing stolons 
(Plate XIII) Bazzania. 
B. 
1. Leaves complicate-bilobed, lobes nearly equal or the lower larger giv- 
ing the appearance of four rows of leaves of which the two upper are 
incubous and the two lower succubous Scapania. 
Leaves not complicate-bilobed, in some cases toothed or divided 2. 
2. Leaves undulate on the margin ; plants densely clustered ; roothairs 
bright claret colored Nardia hyalina. 
Leaves entire or slighly emarginate; roothairs colorless 3. 
Some or usually all of the leaves strongly toothed or lobed; roothairs color- 
less 7. 
3. Leafy stems at least x /% inch wide, leaves plainly overlapping, on ground 
and over mosses, 5. 
Plants about inch wide; many leaves not overlapping 4. 
Leafy stems 1/16 inch wide or less 6. 
4. Aquatic, floating, underleaves absent. 
Chiloscyphus polyanthus var. rivularis. 
On old logs and moist ground, underleaves present Chiloscyphus. 
5. Plants creeping; leaves oblong to oblong-ovate, decurrent Liochlsena. 
Plants ascending; leaves round obovate, not decurrent Plagiochila. 
6. Leaves with a border of larger cells which appear as a whitish margin 
under the lens Odontoschisma and Nardia crenulata. 
Leaves without border of larger cells Jungermannia Schraderi. 
7. Upper leaves with a strongly many toothed margin Plagiochila. 
Leaves 3-5 cleft Jungermannia barbata. 
Leaves two toothed or cleft 8. 
8. Plants minute, leafy stems less than 1/25 inch wide; underleaves absent 
or so small as to be invisible with a lens; leaves round-ovate to- 
obovate, cleft for at least their length Cephalozia. 
(Some small species of Jungermannia may be sought here but their 
leaves are less deeply cleft and the plants are a much darker green). 
Leafy stems at least 1/16 inch wide; leaves two toothed but scarcely cleft .9 
9. Underleaves J/j the size of the other leaves Lophocolea minor. 
Underleaves absent or minute * . 10. 
10. Leaves subvertical, varying from bidentate to retuse, or even entire 
near apex . Lophocolea heterophylla. 
Leaves with the edge attached nearly lengthwise of the stem, extending out at 
almost right angles from it and lying flat in a horizontal plane. Geocalyx. 
Leaves subvertical and all alike inserted more nearly crosswise of the 
stem 11. 
11. On sterile ground in open woods Jungermannia excisa. 
On rotton wood 12. 
12. Leaves round-ovate with an obtuse sinus between the teeth. Harpanthus. 
Leaves subrectangular with an acute sinus ; plants dark to brownish 
green. Jungermannia Michauxii. 
