CLEVEA 87 
ally or rather abruptly reduced to a single series toward the thin 
thallus-margins ; postical scales numerous, hyaline, at least at their 
apices, or rarely purple throughout, obtuse, acute or long-acuminate, 
the anterior usually exceeding the margin of the thallus and often 
conspicuous. Dioicous.  Antheridia immersed, scattered near the 
median line of the thallus, with slender subcylindrical ostiolar pa- 
pillae. © branch from the median dorsal surface of the thallus, com- 
monly arising at a considerable distance back of the apex, single or 
in a linear series of 1-4.  Peduncle subpellucid, without a root-hair 
furrow. © receptacle consisting simply of the 4 (-1) obovoid 
somewhat downwardly inclined involucres, these lightly com- 
pressed laterally and bilabiate about to the middle by a vertical 
cleft, affixed directly to the top of the peduncle or slightly connate 
at the bases. Pseudoperianth none; capsule nearly sessile and 
included or subexserted by a somewhat elongate pedicel, its walls 
on dehiscence cleft to the middle or below into 3-8 irregular 
valves, the cells with numerous annular or spiral thickenings. 
Spores yellowish, red, or brown, densely covered with rather large 
obtusely conical papillae. Elaters 2—4-spiral. 
1. CLEVEA HYALINA (Sommerf.) Lindb. Not. ur Sallsk. pro Fauna 
et Flora Fenn. g: 291. 1868 
Marchantia hyalina Sommerf. Mag. Naturv. II. 1: 284. 1833 
( fide Lindberg). 
Plagiochasma erythrosperma ЗиШу.; Aust. Proc. Acad. Nat. 
ба. Philad. 1869: 229. 1869. 
` Thallus strongly concave or canaliculate above, narrowly ob- 
long to obovate, obcordate at the apex, simple or once forked, 5— 
15 mm. long, 2-6 mm. in greatest width, scales mostly numerous 
and persistent, conspicuously projecting, with rare exceptions, and 
the anterior often inflexed, hyaline, sometimes purple at base, 
rarely purple throughout, acute or acuminate, the occasionally 
subtubulose points with crenulate margins: peduncle usually sin- 
gle, 2-15 mm. high; 9 receptacle 2.5-4 mm. broad, with long 
and numerous white or purplish paleae beneath : capsule dehiscing 
by 3-6 irregular valves, the wall-cells with annular thickenings ; 
spores 44—60 p, reddish-brown, rarely verging toward yellow Or 
darkening ; elaters 120-300 м long, 8-15 и in greatest width, often 
bispiral at the extremities, in the middle mostly tri-, rarely quadri- 
Spiral. 
About rocks in mountainous regions, especially northward. 
« Near a lake on the trail to the White Chief Mine, 1100 ft. above 
Mineral King, Tulare Co." (Coville and Funston, Death Valley 
