HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 27 
SCLEROPHYTON Eschw. 
Differs from the genus Chiodecton only in having dark spores. 
1. Sclerophyton californicum (Tuck. ). 
Chiodecton californicum Tuck. Syn. N. Amer. Lich. 2: 135. 1888. 
Thallus “pale ochroleucous,”’ thickly crustaceous, darkening with age; apothecia 
numerous,.crowded, the thecial structure composed of a stroma of several apothecia 
surrounded by a turgid, persistent, thalline margin; disk dull black but densely 
pruinose and thus concolorous with the thallus, from round to angular and variously 
difform; thallus at the circumference inclining to become lobular ana limited by a 
dull black hypothalline border; with KHO—, Ca(ClO),.-++-red, the medulla—; epithe- 
cium subgranulose and but little darker than the thecium; thecium 140 » high, pale 
sordid yellow giving no reaction with iodine; paraphyses interwoven, slender; hypo- 
thecium dark brown; asci clavate, thick-walled; spores in 8’s, oblong-ellipsoid with 
blunted ends, brown, 6 to 8-locular, the cells cylindric, the spores 20 to 30 » long 
and 5 to 7 » thick. 
Near Newport on Lycium californicum and on shrubs near San Diego at Point Loma; 
Santa Catalina Island at the “isthmus” on Rhus integrifolia. 
DIRINACEAE., 
Thallus crustaceous, uniform, attached to the substrate by hyphe of the medullary 
layer; gonidia Chroolepus. Apothecia round orelongated with a proper and a thalline 
margin; hypothecium dark; spores parallel several-locular. 
DIRINA Fries. 
Paraphyses simple, unbranched; asci 8-spored, colorless, oblong or fusiform; sper- 
mogones immersed; spermatia arcuate. 
The only genus representing the family in our district. Our species growing on 
bark. 
KEY TO SPECIES. 
Hymenial gelatine with iodine yellow.......................... 1. D. hasset. 
Hymenial gelatine with iodine vinous red... .............-.--- 2. D. rediunta. 
1. Dirina hassei Zahlbr. Bull. Torrey Club 27: 644. 1900. 
Thallus. effuse, crustaceous, furfuraceous, finely rugulose, pale creamy whitish; 
apothecia small, numerous, sessile; disk planoconvex, dark, thickly pruinose, with 
an entire, thin, persistent thalline margin; epithecium light yellowish, granulose; 
thecium colorless, 76 to 80 high, staining with iodine a rich yellow; paraphyses 
thin, entire, coherent; hypothecium brown; asci oblanceolate or subsaccate, 60 to 
64 » long, 10 to 12 » thick; spores fusiform, colorless, slightly curved, obtuse, 4-locular, 
16 to 20 # long, 4 to 5 » thick. 
On bark of Rhus laurina. Type locality, beach near Santa Monica. The species 
occurs also on Santa Catalina Island on the bark of Heteromeles arbutifolia. 
Type deposited with Dr. A. Zahlbruckner; duplicate in herb. Hasse. 
2. Dirina rediunta (Stizenb.) Zahlbr. in litt. 
Lecanora rediunta Stizenb.; Hasse, Bull. Torrey Club 24: 446. 1897. 
Thallus crustaceous, whitish to cream colored, effuse, smooth, continuous to finely 
rimose, epiphloeodal, KHO+ light yellow, Ca(ClO),—; apothecia sessile, dispersed 
or at times crowded, small, 0.5 mm. wide; disk black, planoconvex, thickly white- 
pruinose with a thin, persistent, entire thalline margin; epithecium granulose, dark; 
thecium pale yellowish, 96 to 112 » high, with iodine vinous red; paraphyses coherent; 
asci clavate, 64 to 68 long by 104 thick; spores fusiform, colorless, straight or 
lightly curved, blunt, 20 to 26 » long, 4 to 6 » thick, 4 to 11-locular. 
60653°—13——3 
