метр тү пещи Y ТЕЕ 
а о с ial 
Era И 
ТАУКЕН a ИИИНИН ЕО 
Riccia 23 
5. RICCA MINIMA L. р, р. Sp. Pl. 1139: 1753. 
Riccia sorocarpa Bisch. Act. Acad. Саез. Leop.-Carol. Nat. 
Cur. IVE IOS, tess; 
Thallus at first subradiate, forming later irregularly gregarious 
patches, of a bright, clear, subcrystalline light green (not puberu- 
lent or scurfy) when living or when soaked out with water, of a 
lighter green when dry, minutely, regularly, and compactly reticu- 
late above when moistened, sometimes nearly smooth on drying, 
concolorous below ; the principal divisions 4—7 mm. long, bifid or 
once or twice dichotomous ; the terminal segments oblong, .75-2 
mm. wide, subacute, carinate-inerassate, with an acute median 
furrow and naked, ascending, for the most part sharply acute, often 
hyaline and submembranous margins, furnished beneath toward th? 
apex with small whitish or hyaline scales, these often reaching the 
margin but not surpassing it, На margins commonly elevated ог 
somewhat incurved on drying ; transverse section parabolic or sub- 
quadrate, its width 1-4 к its height, about 25 cells thick in 
median parts, air-chambers narrow ; epidermis of two.or three layers 
of cells, those of the superficial stratum at first papilliform, the 
lower portion of their wall becoming thickened and the upper soon 
vanishing, leaving behind persistent cups attached to the likewise 
thick-walled cells of the subjacent layer: monoicous : о 
few, the ostioles short-cylindrical, elevated about .08 mm.; сар- 
sules usually numerous, with age sometimes emergent- әкетай 
toward Ше base of the segments by rupture of the naked covering ; 
spores dark brown, 70-90 и in maximum diameter, angular, with 
a brownish granulate-papillate and crenulate, usually interrupted 
margin 3—6 и broad, the outer face areolate, 10-12 meshes measur- 
ing its diameter, exhibiting in profile papillae mostly 3-6 и long, 
the inner faces densely and rather minutely punctate or furnished 
with very short and numerous low ridges which до not form 
areolae. 
Exsicc. Нер. Am. 139 (as А. glauca). 
Not uncommon in the coast region, often associated with А. 
Сапјоттса. 
Berkeley, Oakland, Fruit Vale ; Clarendon Heights and near 
Mission Dolores, San Francisco; Fort Ross, Sonoma Co.; Ukiah 
(782); Mitchell Cafion, Mt. Diablo; near Stanford University (D. 
Н. Campbell); Pasadena (A. J. McClatchie). 
The Californian plant is usually larger than the European speci- 
mens that we have seen, yet it very rarely attains the dimensions 
of representatives of this species collected in Siberia by Dr. H. W. 
