16 RICCIACEAE. 
oblong, subacute, with a few usually quite inconspicuous hyaline _ 
or whitish ventral scales at the apex, the flat-bottomed median | 
sulcus occupying about one third their width but narrowed and | 
apparently closed in front by the convergence of the abruptly аз- | 
cending margins, these often incurved on drying, somewhat incras- | 
sate, though commonly subacute, in cross-section, bearing in a _ 
single or double series a few stout obtuse or sharp-pointed cilia 
.1-.3 mm. long; transverse:-sections rounded ventrally, their | 
width 2-3 times their height, about 20 cells thick in median parts, | 
the air-chambers narrow ; cells of the superficial layer of the epi- | 
dermis soon collapsed and disintegrated or irregularly persisting | 
as cups attached to the cells below: monoicous: antheridia | 
abundant, their ostioles prominent, conic-cylindrical, .1—.2 mm. | 
high: capsules with a naked, sometimes purple thallus-covering ; | 
spores brown, 75-118 и in maximum diameter, angular, with a | 
slightly. granulate, more or less interrupted margin 3-12 p in 
width, the outer face lightly papillate or nearly smooth in profile, | 
8 or 9 strongly defined areolae measuring its diameter, the inner | 
faces a little less distinctly areolate or marked with. ridges which | 
scarcely anastomose. | 4 
On the bank of a rivulet, Fort Ross, Sonoma County, March | 
15, 1896. 3 
The Californian plant differs from {һе typical А. Lescurzana | 
chiefly in the larger spores (90-118 и in the former ; 75-100 in 
the latter) which are also more distinctly areolate on the inner | 
faces.. The thallus-margins and the thallus-covering of the cap- | 
sules, too, show less purple than Mr. Austin’s original plants from 1 
New Jersey, but these differences, we think, are not sufficiently | 
important to be considered specific. Specimens collected at Jack- 3 
sonville, Florida, by J. Donnell Smith іп. 1877, agree essentially | 
with the Fort Ross plant. Riccia Lescurianais perhaps more likely 1 
to be confused with А. Californica than with any of the other 1 
Californian Ricciae, from. which, however, it may be easily distin- | 
guished by the larger spores, Ше prominent antheridial ostioles, 4 
the shorter, stouter cilia, etc. ? 1 
We would place; for the present, with the above species. a | 
somewhat anomalous Riccia collected in California by Bolander | 
(in herb. Underwood, from U. S. National Museum). The thallus | 
is but once forked arid unusually thin, the transverse sections be- 
ing 4-6 times as wide as high ; the cilia are rudimentary or want- 
ing ; the spores have more numerous and smaller areolae, 10-12 - 
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