RICCARDIA 73 
softer, flatter thallus, without indication of a unistratose margin, in 
the looser texture, and according to authors, in being dioicous and 
in having a smooth calyptra. АП specimens of Riccardia pinnati- 
Лаа that we have had an opportunity of studying have, unfortu- 
nately, been sterile. It appears to be an aquatic plant, for the 
most part. 
3. RICCARDIA MULTIFIDA AMBROSIOIDES (Nees) Lindb. Acta Soc. 
Sci. Fenn. to: git, ОТЕ 
Апсита multifida ambrosioides Nees, Naturgesch. Eur. Leberm. 
3: 490. 1848. 
Thallus bi- or tri-pinnate, often expanding to form radiating 
clusters or half-rosettes, the branches crowded, rather narrow 
-34-.85 mm. broad), biconvex with a unistratose margin two or 
three cells in width, thus presenting a quite clearly defined sugges- 
tion of a costa : monoicous, sometimes paroicous (rarely dioicous 2): 
androecium usually distant from 9 branch, oval, oblong, or linear, 
-65-.93 х.25-.33 mm., with a hyaline crenulate margin, and bear- 
ing 3—7 pairs of loculi, or 2 or 3 antheridia sometimes immersed in 
base of the 9 branch (paroicous): margin of 9 branch with 
copious laciniae, each commonly ending in a single row of cells; 
calyptra much roughened, 3-4 mm. high: capsule brown, oblong- 
ellipsoidal; elater-bearers about is the length of the valves ; 
elaters mostly 250—480 м long, 18 и in greatest width, attenuate 
at the ends; spores 15 //, nearly smooth. 
On decaying wood and moist banks. Olema (118 7), Mendo- 
cino (586, 666), Eureka (964) and Hay Fork (1188). The last- 
mentioned specimen seems to be strictly dioicous, and a tendency 
to restriction of the two kinds of organs to separate individuals 15 
Sometimes to be observed in our other Californian specimens. The 
description of the sporogonium is drawn from no. 944, Jack, Leiner 
and Stizenberger, Kryptogamen Badens. 
4. Riccarpia LATIFRONS (Lindb.) Lindb. Acta Soc. Sci. Fenn 
тоз s13. I 
Алеиға latifrons Lindb. Not. pro Fauna et Flora Fenn. 13: 
372. 1874. > 1 t when 
Thallus light green or darkening on drying, translucen 
Moistened, palmately divided; the ultimate branches oblong = 
linear, usually 2-4 mm. long, .83- mm. wide, singe A 
Strongly emarginate, slightly convex dorsally, plane or subcon 
