FOSSOMBRONIA 79 
Beside a pool, Blue Lake, Humboldt Со. (1002). Our speci- 
men is simply gemmiferous ; the above description of the sporo- 
gonium is drawn from а Swedish plant collected by Dr. Arnell. 
16. FOSSOMBRONIA Raddi, Atti Soc. Ital. Sci. Mod. 18 :— 
(29). 1818. Mem. Mat. е Fis. Soc. Ital. Sci. 
Мод. 18: 40. 1820. 
Gametophore consisting of a creeping, simple, furcate, or inno- 
vating stem with 2-ranked, obliquely inserted succubous leaves. 
Stem flattened above, closely attached to the substratum by very 
long, mostly violet- or vinous-purple root-hairs. Leaves assurgent 
or subvertical, undulate-crisped, especially on drying, usually im- 
bricate, subquadrate, often broader than long, the bases extending 
far onto the dorsal side of the stem and more or less decurrent, 
veolate, or 
ces much 
less Strongly roughened, in most cases simply punctate, verrucose- 
Papillate, or marked with short, low ri 
2- or 3- (1—4-) spiral. 
