RicciA 21 
sisting only as imperfectand irregular cups or more often as mere 
wall-fragments adhering to the hyaline and nearly empty cells of 
the primitively lower layer: monoicous : antheridia infrequent, the 
ostioles not elevated above the surface of the thallus : archegonium- 
neck exserted and often conspicuous even at maturity of the spor- 
ogonium : ада deeply immersed, with a naked long unruptured 
covering, in rare cases exploded- protuberant with age; spores 
brown, nally darkening but always more or less translucent, 70- 
до и in maximum diameter, distinctly angular, with a smooth уе!- 
low or brownish irregularly crenate margin 3-12 и in width, the 
diameter of the outer face measured by 10-13 areolae, these mostly 
6-104 in width, the papilliform elevations at the angles of the 
meshes 3-4 и or less in height when seen in profile, the inner faces 
with similar but less papilliform-angled areolae. 
On lightly shaded banks. “ California" (Dr. Bolander ; the 
original specimens in Herb. Pearson) Berkeley (Howe), Fruit 
Vale (Miss Edith S. Byxbee) ; Clarendon Heights, San Francisco 
(530*), and near the Mission Dolores (512) ; Ukiah, Mendocino Co. 
(783); Silver Lake, Alpine Co. (Geo. Hansen). 
The cilia in this species are occasionally reduced and incon- 
spicuous, but are always present, we believe, even though some- 
times only in a rudimentary form. 
Riccia subinermis Lindb. (1881), of which we have been allowed 
to see authentic specimens through the kindness of Mr. Harald 
Lindberg and specimens of which we also owe to Herr M. Heeg, 
differs from А. Californica in the usually much shorter and less 
numerous cilia, in the elevated conico-cylindrical antheridial ostioles, 
in the larger meshes of the outer face of the spores, in the less 
regular areolation of the inner faces, etc. Theareolae of the outer 
face in R. subinermis and R. glauca are mostly 10-15 и in width, 
while in А. Californica they are usually only 6-10 и wide. We 
agree with Dr. Levier and others in thinking Riccia subinermis 
doubtfully distinct from A. glauca. 
PLATE 89. КІССІА CALIFORNICA. 
I. The plant, natural size, from a dried specimen. 
2. Two of the principal segments of the thallus, from alcoholic material, >< 5. - 
3. A portion of Austin’s original plant (soaked out), ех делі. Pearson, X 5. 
4-8. Outlines of transverse sections оГа ape segment at быны regular іп- 
tervals, passing from near apex toward Ше base, 23 
* The numbers refer to specimens collected by the author. 
