164 JUNGERMANNIACEAE 
Porella dentata Lindb. Act. Soc. Sci. Fenn. 0: 342. 1869. 
Dull, or very rarely a little polished, opaque, commonly dark 
green, sometimes yellowish, mostly soft and flaccid: stems irregu- 
larly pinnate or subdichotomous, 3-10 cm. long, prostrate ог as- 
cending, forming loose or more dense mats, branches somewhat 
obtuse, scarcely diminishing in width toward apex : dorsal lobes of 
leaves usually subimbricate or approximate, sometimes distant, rarely 
closely incubous, obliquely ovate to orbicular-ovate, rounded-ob- 
tuse, 1-2 mm. x .8-2 mm., entire or subdenticulate, flat or slightly 
concave beneath, only a little decurved at the apex, trigones mostly 
underleaves distant, quadrate, orbicular to broadly ovate, about 
On moist rocks, stones in streams, and bases of trees in densely 
shaded places. Widely distributed and extremely variable accord- 
ing to habitat. 
Near Berkeley (7d, 7e, 19, 1175, 1182, 1214); Mill Valley and 
Olema (1178); Cazadero (1179); Mendocino (714, 718); Ukiah 
(745); Blue Lake (1177); Russ & Graham’s Ranch (1084) 
Humboldt Co.; Sisson, Siskiyou Co., (1176); Cow Creek and 
Burney Falls, Shasta Со. (М. S. Baker & Е. P. Nutting) ; Yose- 
mite Valley region (C. М. Cooke, Jr). Collected in California 
by Dr. Bolander also, the exact localities unknown, and by Mr. 
S. B. Parish in the southern part of the state. 
Our determination is based upon the drawing (accompanying | 
С. & В. Нер. Ечг. по. 371) of the original plant from the bed is 
