12 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
2. Arthopyrenia biformis (Borr.) Muell. Arg. 
Thallus gray, smoothish or- finely furfuraceous, diffuse; apothecia entire, conical- 
semiglobular, black, glistening, scattered, their base partly covered by minute 
thalline furfur; paraphyses slender, scantily branching, and loosely interwoven; asci 
cylindric, 100 # long, 12 » thick; hypothecium pallid; spores in 8’s, bilocular, often 
parted unequally by the septa, slightly curved, ovoid to oblong-ovoid, 12 to 17 
long, 7 to 8 # thick; hymenial gelatine giving no reaction with iodine. 
Santa Catalina Island on Heteromeles arbutifolia. 
PORINA Ach. 
Paraphyses not branching, separate; asci 4 to 8-spored, the spores 2 to several-locular, 
A single species found within our limits. 
1. Porina plumbaria (Stizenb.) € ¢4 4 CAS. 
Verrucaria plumbaria Stizenb. Bull. Torrey Club 24: 448. 1897. 
Verrucaria carpinea plumbaria Nyl.; Hasse, Lich. South. Calif, 18. 1898. 
Thallus thin, smooth, silver gray; apothecia numerous, dispersed; perithecium 
horny, black, shining, semiglobose with a minute aperture; paraphyses loosely netted- 
branching, distinct, permanent; hypothecium colorless; asci cylindric, straight, 60 4 
long, 12 « thick; spores fusiform, bilocular, the loculi equal, and in fully matured 
spores each loculus constricted, mostly disposed in single file, or somewhat oblique, 
in some cases partly in two rows, 15 to 20 # long, 3.5 to 4 » thick; with iodine the hypo- 
thecium and protoplasm of the ascus contents staining yellow, except the ascus mem- 
brane, this with the spores and paraphyses not affected by the reagent. 
Frequent in the Santa Monica Range on various smooth barks, principally on 
Quercus agrifolia. 
THELOPSIS Ny]. 
Asci many-spored, the spores 2 to 4-locular; otherwise as in Porina. 
Represented with us by one species. 
1. Thelopsis subporinella Nyl. sp. nov. in litt. 
Thallus crustaceous, uniform, the hypothallus invisible; apothecia mostly crowded, 
embedded in soft, buff colored, thalline warts, solitary or sometimes 3 or 4 in a wart 
(without a stroma formation), a light brown ostiole situated at the apex of the globular 
thalline verruca; paraphyses not sharply defined but permanent, not branching, 
filiform; asci fusiform and broadly fusiform, membrane thin, 180 # long, 20 to 30 # 
thick, spores numerous in the spore sac, colorless, bilocular, oblong-ellipsoid, 13 to 18 
long, 6 to 7 # thick, the epispore thin, surrounded by a narrow halo; ascus contents and 
hypothecium staining pale amber with iodine, the ascus membrane and the spores 
and paraphyses not affected. 
On Umbellularia californica in Malibu Canyon (type locality) of the Santa Monica 
Range. 
PYRENIDIACEAE. 
Thallus membranaceous, crustaceous-squamulose, or foliaceous, homceomerous or 
stratified, with Nostoc or Sirosiphon gonidia; perithecia simple, vertical. 
HASSEA Zahlbr. 
Hassea Zahlbr. Beih. Bot. Centralbl. 18: 150. 1902. 
“Thallus crustaceus, uniformis, hyphis medullaribus substrato affixus, rhizinis 
destitutus, homoeomericus, ecorticatus, gonidiis nostocaeis, glomerulosis. Apothecia 
pyrenocarpica, simplicia, gonidiis hymenialibus nullis, perithecio recto, fuligineo. 
Paraphyses laxa ramoso-connexae, parum conspicuae. Asci 8-spori. Sporae bacil- 
lares, simplices et hyalinae. Pycnoconidia ignota.”’ 
