28 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Type locality, Santa Catalina Island. On Heteromeles arbutifolia; also on bark of 
Juglans californica and other barks in the Santa Monica Mountains. 
Type deposited with Dr. A. Zahlbruckner; duplicate in herb. Hasse. 
ROCCELLACEAE. 
Thallus fruticulose, erect, attached by a basal disk; cortical and medullary layers 
distinct, with Chroolepus gonidia; apothecia round, lirelleform, or deeply lobed, 
innate or sessile. 
KEY TO GENERA, 
Cortical hyphe parallel to thalline surface; apothecia round. DENpRoGRAPHA (p. 28). 
Cortical hyphe vertical to thalline surface. 
Apothecia round... 2.2.0.2... 000. ee cece eee eee ..... Rocce na (p. 28). 
Apothecia deeply lobed; spores dark...............-.. ScHIZOPELTE (p. 29). 
DENDROGRAPHA Darbish. 
Differing from Roccella only in the fact that the cortical hyphe are parallel with 
the thalline surface instead of vertical to it. 
KEY TO SPECIES. 
Main trunks compressed, stout..............2..02020202-20005 1. D. leucophaea. 
Main trunks not compressed, slender......................2-- 2. D. minor. 
1. Dendrographa leucophaea (Tuck.) Darbish. 
Thallus fruticulose, erect, densely branching, the main trunks compressed, the 
branches and branchlets terete, smooth, becoming finely attenuate, light yellowish 
gray and darkening to dull brown gray; apothecia numerous, mostly on the lower 
compressed portion of the thallus, sessile or subpedicellate, the disk circular, convex, 
dark, thickly pruinose, the thalline margin entire, persistent; epithecium pale 
yellowish gray, granulose; thecium colorless, 130 to 140 « high, stained yellow with 
iodine; paraphyses loose, branched and forked below the tips, interwoven, the 
scarcely thickened apices not colored; hypothecium dark brown black, thick; asci 
suh* dated-clavate, the membrane thick, not colored by iodine but the contents yellow; 
* pores fusiform-ellipsoid with blunt ends, straight or lightly curved, colorless, 20 to 
27 p long, 5 to 7 # thick, 4-locular; spermogones numerous, sterigma straight, entire, 
forked, with acicular, hook-shaped or curved spermatia 12 to 16 p long. 
Santa Catalina Island, Z'rask; on Lycium californicum near San Pedro; Newport; 
on Pinus torreyana at Del Mar, near San Diego; Lower California. 
2. Dendrographa minor (Tuck.) Darbish. 
Thallus fruticulose, slender, intricately branched, the basal disk rudimentary, the 
small trunk little if at all compressed, about 3 to 4 cm. high; soredia frequent but 
apothecia thus far not found. 
On maritime rocks, rarely on shrubs, at San Francisco, Herre, and San Diego, Orcutt; 
frequent at Newport on rocks and occasional on shrubs; on rocks on Santa Catalina 
Island, and doubtless at other stations along the coast. 
ROCCELLA Lam. & DC. 
Thallus fruticulose, erect, loosely branching, compressed or subterete; hyphe of 
cortex vertical to thalline surface, with Chroolepus gonidia; basal disk corticate or 
ecorticate; soredia frequent; apothecia lateral, sessile, round with a black or decolor- 
ate proper margin and encircled by a thalline one; hypothecium black; paraphyses , 
branching; asci 8-spored; spores colorless, oblong-fusiform, parallel 4-locular; sper- 
matia staff-shaped, arcuate. 
