ANTHOCEROS 185 
thickenings begin to appear in January or February, attaining full 
development in May or June. In our no. 702, collected near 
Mendocino, California, these marginal thickenings often enclose 
numerous antheridia. 
The above description of Anthoceros Pearsoni is based upon 
various specimens, but our по. 16, collected at Mill Valley, Marin 
County, May 7, 1892, from which the figures of the spores, pesudo- 
elaters and capsules have been drawn, we consider the type of the 
species, 
PLATES 119 and 120. ANTHOCEROS es 
I. pers of the thallus, with mature sporogonia, natural s 
„за . Portions of а sterile thallus, showing its тану manner of branching 
and he еи of the marginal glandular-thickenings, stein size. 
. Marginal glandular-thickenings, fully develope 
6 and 7. Thallus segments with younger, пик а glandular thick- 
enings, Х 12. 
8. Ventral view, showing glandular-thickening bearing root-hairs, X I 
9 and то. Longitudinal sections through well-developed кайан ыны 
the Екі exhibiting embedde theridia, 53. 
. Transverse section kde margin of the thallus, X 53. 
12. Median знает section of the thallus, X 53. 
17. Spores, Х 305. 
Figs. 1, 13, 16 and 17 from no. 16, Mill Valley, eis Co. ү їуре); 2—4, 
пеаг Vip s Mills, Sonoma C ги 1200); 5, 2: 10, 14 and 15, near Mendocino 
о. 794 and 7, Cazadero, 5, a Co. (no. 1199); у. Ра]о aie (Prof. D. H. 
Сам СЫ, тт апа 12, МШ Valley, Feb. 22; и 
3. ANTHOCEROS CAROLINIANUS OCCIDENTALIS М. A. Howe, Bull. 
Torr. Bot. Club, 25: 8. РА 327. 1898. 
Thallus large, thin, riam usually densely caespitose, ascend- 
ing, now and then with m gins and lobes glandular-thickened, 
light- or dark-green, a little етай ог, on drying, opaque with a 
somewhat fatty lustre, dissected ; major segments oblong or a 
vate, 1-3 times subdichotomously branched, 8-30 mm. х 2-7 m 
more or less widened at the rounded crenate apex, 4-8 cells thick 
in the middle, passing gradually into a wide 3- or 2-stratose mar- 
gin, or nearly uniform throughout ; surface-cells distinct in terres- 
trial forms, obscure in the aquatic, irregularly rhombic, becoming 
elongate-hexagonal, 20-120 и x 18-30 и: monoicous : involucres 
sometimes united in pairs, thick-walled, somewhat pellucid, long- 
cylindrical, 2-6.5 mm. x.5-1 mm., sometimes contracted or now 
