68 CONTRIBUTIONS FROM THE. NATIONAL HERBARIUM, 
simple, entire, loose, not thickened above; hypothecium colorless; thecium 140 to 
150 « high, colorless; asci inflated-clavate, the membrane thin without thickening of 
the upper part, about equaling the thecium in height; spores minute, numerous, 
oblong, 3 to 4» long, barely 1 « thick; hymenial gelatine with iodine blue throughout, 
darkest at upper part. 
On argillaceous shale, Santa Monica Range. Type locality, foothills near the Sol- 
diers’ Home. 
Type deposited in herb. Hasse. 
14. Acarospora glebosa Koerb. 
Thallus of round, reddish brown, convex squamules not exceeding 1 mm. in width, 
scattered or approximate, the squamules in the latter case becoming angular and 
rimose; apothecia small, punctiform, depressed, generally single, rarely two in a 
squamule, the disk at last slightly enlarged and concave, dull black with a rim of 
thalline margin; epithecium continuous, dark reddish brown; thecium colorless, 
about 120 » high, stained blue with iodine, particularly the hypothecium being dark 
blue, the epithecium showing no reaction; paraphyses moderately stout, loosely 
coherent but adglutinated at the tips; hypothecium colorless; asci ventricose, the 
membrane thickened at the top, 100 # long, 36 « thick; spores 24 in each ascus, bluntly 
ellipsoid, 11 to 18 » long, 5 to 8 » thick; Protococcus gonidia forming a thick sub- 
cortical layer extending also under the hypothecium. 
On sandstone, Santa Monica Range. Outwardly very similar toa Heppia. 
PYRENOPSIDACEAE. 
Thallus crustaceous (in our species), dark, dull black; apothecia urceolate or 
expanded; parathecium and hypothecium well developed or obsolete; paraphyses 
gelatinous, not branched nor jointed; asci 8 to many-spored; spores colorless, ovoid- 
ellipsoid to globular, simple, rarely bilocular; spermatia ovoid, oblong to acicular, 
straight or curved. 
Of the genera classed with this family we have only the following: 
PSOROTICHIA Mass. 
Crust granular-areolate; gonidia consisting of Xanthocapsa algee, the cells round, 
blue green, clothed with a yellowish to yellow brown gelatine; apothecia immersed 
and urceolate, finally opening, furnished’ with a proper and a lecanorine margin; 
paraphyses few, slender, adglutinated_6r separate; asci 8-spored, exceptionally 4 to 
32-spored; spermatia oblong-ellipsoid. - \ 
KEY TO SPECIES. 
Growing on earth. 
Contiguous squamules forming green black patches........., 1. P. segregata. 
Growing on rock. 
Squamulose; squamules lobate, forming small green cushions. 3. P. squamulosa. 
Not squamulose. 
Forming coralloid black patches......................... 2. P. arnoldiana. 
Crustaceous. 
Green black, areolate-rimose............-........22. 4. P, schaereri. 
Dark brown, coarsely granulose.................... 5. P. phaeococca. 
1. Psorotichia segregata (Nyl.). 
Collemopsis segregata Ny1.; Hasse, Lich. South. Calif. 6. 1898. 
Crustaceous thallus blackish green, the small patches not over 1 cm, in diameter, 
without rhizine, homogeneous with submoniliform blue green gonidia; the thallus 
almost entirely covered by the apothecia, these 0.2 mm. wide, at first urceolate with 
