T4 METZGERIACEAE 
beneath, without suggestion of a costa, the unistratose margin only 
one cell in width, very rarely gemmiferous at apex; surface-cells 
pentagonal, hexagonal or irregularly oblong, large, pellucid, 45- 
118 x 29-50 и: monoicous: androecium affixed to base of 9 
branch or distant, oblong, .66-.85 х.27-.33 mm., somewhat nar- 
rowed at base, with an erect laciniate margin, loculi about five 
pairs: 9 branch with numerous small marginal laciniae mostly 
composed of a single row of cells; calyptra pyriform-clavate, 
slightly verrucose near apex, 2.5-3.5 mm. high, .75—1 mm. broad | 
above: elaters 120-240 и long, 15 и in maximum width ; spores 
brownish-green, minutely papillate, 13—21 p. 
On decaying logs. Redwood Сайоп, Marin Co. (1184); 
Navarro (Miss Edith S. Byxbee) and Mendocino (392, 721, 676); 
Kneeland Prairie, Humboldt Co. (1023); near Hay Fork, Trinity 
Co. (1112, 1129); Sisson, Siskiyou Co. (39). The species was’ 
collected in California by Dr. Bolander, also, the exact locality 
unknown. . у 
Lindberg's original description seems to call for a larger plant 
than ours, yet the Californian specimens agree very closely with 
G. & R. Hep. Eur. no. 493 and Sulliv. Musc. Allegh. no. 279, 
Which were referred to R. latifrons by Lindberg, and also with 
specimens collected in Sweden by Arnell. 
The branching may be subpinnate below, but ultimately is 
always pronouncedly palmate or subdichotomous. 
5. RICCARDIA PALMATA (Hedw.) Carruth. Seeman's Jour. Bot. 3: 
$02. : 1865. 
: : Jungermannia palmata Hedw. Theor. Gen. 8 7. pl. 18. f- 93792 
1784. 
Thallus opaque, compact, dark green on drying, palmately 
branched or subdichotomous, usually without trace of a unistratose | 
border, almost always bearing gemmae at apices both: dorsally and 
ventrally ; gemmae of two cells, formed endogenously from cells | 
of the surface; surface-cells small, quadrate-rhombic or oblong- 
pentagonal, 23-59 x 15-29 м: dioicous: 4 thallus narrow, bi- 
convex, sometimes nearly terete, the branches .18—.35 mm. № 
pex or slightly notched; 9 plants broader and | 
ДЕ Segments .5—1 mm. wide: androecia oblong or linear, 
b HY Ран, BET X „2542 mm., with entire inflexed тет" | 
ranous margins, sometimes proliferous at apex, loculi 4-8 рай? | 
at maturity: 9 branch subentire, or with a few short and ШШ 
