1894. ] The Genus Riccia. 275 
Lindenb. (known only from the very imperfect specimens dis- 
tributed in Austin’s Hepat. Bor.-Am.) and R. cz/iata which is 
known from this country only through the report of Austin, 
there being, so far as I know, no specimens at hand. 
R. CRYSTALLINA L.—The figures of this species in Lind- 
enberg’s Monograph ‘do not fairly represent the species as 
it appears in various European exsiccate nor do they conform 
to the usual description. Misled by this inaccurate represen- 
tation we issued plants under this name that are quite readily 
distinguished from R. crystallina now that suitable material 
is at hand for comparison. There is some resemblance be- 
tween R. crystallina and R. Frostii in the method of dis- 
Semination of spores but they are distinguished by their 
thallus characters. 
The following undescribed species have been sent in from 
southern and lower California: 
; Riccia aggregata, n. sp.—Thallus 1-3 dichotomous, form- 
ing more or less radiately divided crowded masses 1I-2™ 
or more in diameter; divisions of the thallus narrow (I-1.5""), 
solid, papillose-reticulate and green above, purplish beneath 
and provided with purplish scales not exceeding the margin 
of the thallus which is somewhat membranous; capsules 
rather prominent, with a purple spot in the thallus just above; 
Spores 70-784 in diameter, nearly black, finely reticulate but 
almost opaque, scarcely margined. 
On the ground, Pasadena, California, March 1893. (A. F. 
McClatchie, no. 24.) 
Riccia Cataline, n. sp.—Thallus thin, loosely attached to 
| the soil, 3-4™ in diameter, stellately or radiately 3-6 dichoto- 
; mous; divisions of the thallus broad (2—3™"), more or less re- 
| ticulate-spongy above, the apices more or less expanded and 
| fmarginate, naked beneath and at the margins; capsules 
| arge, in one or two rows; spores 86-95 in diameter, very 
| dark brown, nearly opaque, with very large obscure reticula- 
| tions which often contain a free ridge-like crest, bordered 
| with a more or less minutely crested margin. 
| Wet soil in a cafion, Santa Catalina Island, California, 
| September, 1893. (McClatchie, no. 441.) 
Riccia Brandegei, n. sp.—Thallus orbicular, 2-4™ in diam- 
eter, stellatel many times divided, closely attached to the 
Soil; divisions of the thallus narrow (1-1.5""), spongy-cellular, 
