CHILOSCYPHUS 119 
(683), Mendocino Co.; Big Valley Mts. and White Horse Lake, 
Modoc Co. (M. S. Baker and F. P. Nutting). 
In our only specimens with sporogonia (Big Valley Mts., 
Baker and Nutting), the calyptra is included within the perianth or 
but slightly exserted. The Ф branches in this originate a little to 
one side of the middle line of the ventral surface of the stem and 
are no more strictly ventral than in Lophocolea cuspidata. When 
sterile, there is a possibility of confusing the species with Lopho- 
colea heterophylla, but the more entire leaves with larger leaf-cells 
and usual absence of trigones and the simpler underleaves are 
commonly distinctive. Antheridia can be found in most specimens 
and their distribution along the back of the main stem in smaller, 
more dorsal pouches of otherwise scarcely modified leaves is also 
characteristic. 
16. CHILOSCYPHUS POLYANTHOS RIVULARIS (Schrad.) Nees, Natur- 
gesch. Eur. Leberm. 2: 374. 1836. 
Jungermannia pallescens rivularis Schrad. Syst. Samml. Krypt. 
Gew. 2: 7. 1797. 
Jungermannia aquatica Schrank (?), Bai. Fl. 2: 496. 1799. 
Aquatic, usually larger in all parts, dark green, with a some- 
what fatty lustre: stems I.5—10 cm. long, more ramose: leaves 
sometimes broader than long (now and then 2-2.5 mm. broad), 
mostly rounded at apex; leaf-cells opaque, the superior and me- 
dian 24-50 и: underleaves destroyed or wanting except in the 
youngest parts: always (2) sterile. 
Exsicc. Hep. Am. 92. 
In running water or on the banks of streams. “California” 
(Bolander); Cazadero, Sonoma Co.; Navarro (Miss Byxbee), North 
Fork of the Little River (613), Mendocino Co. ; Eureka (956) and 
Russ & Graham’s Ranch (1085), Humboldt Co.; near Douglas 
City (1 143), Trinity Co.; Sisson (35), Siskiyou Co. ; Dixey Val- 
ley and Bridge Creek, Lassen Co. (Baker & Nutting); Lake 
Tahoe (W. C. Blasdale, 1897); region of the Yosemite (C. M. 
Cooke, Jr., 1896). 
The variety rivuaris is often very different from the pale, large- 
and translucent-celled, wood-inhabiting condition of the species, 
yet the two appear to be connected by riparian forms. Our Sisson 
Specimen, distributed in Hep. Am. as по. 92, differs considerably 
