126 



18. ROCCELLACEAE [67. Schizopelte 



A. On rocks .«■*•* 



B. Thallus whitish to yellowish gray, branches flattened .... 1. R. lucilormis 



B. Thallus greenish gray to whitish, branches round or flattened . . 3. R.tinctoria 



1. Roccella fuciformis (L.) Lam. & DC, El Fr. III. 2:335. 1815. 



Lichen fuciformis L., Sp. PI. 1147. 1753. 



Thallus erect, dull whitish to yellowish gray or grayish, dichotomously divided 

 into long, slender, flattened, narrow, pointed, ribbon-like branches; apothecia 

 middle-sized to large, 0.8-2 mm. across, marginal and terminal, sessile, the disk 

 flat, grayish pruinose or rarely blackish, the exciple thin, colored like the thallus, 

 becoming crenulate; asci clavate to innated-clavate ; spores fusiform, 20-28 X 



4-7/*. 



On rocks, California. 



2. Roccella phycopsis Ach.; Weber & Mohr, Arch. Nat. 1:110. 1804. 

 Lichen fucoides Neck. R. fucoides (Neck.) Vainio. 



Thallus erect and spreading, dull ashy to whitish, becoming dichotomously 

 much-branched, the branches long, flattened, pointed, more or less covered with 

 whitish soralia; apothecia small, 0.4-0.8 mm. across, lateral, sessile, the disk flat, 

 black or whitish pruinose, the exciple thin, colored like the thallus, rarely dis- 

 appearing; spores oblong-fusiform, 12-16X3-4 /a. 



On shrubs, southern California. 



3. Roccella tinctoria Lam. & DC, Fl. Fr. III. 2:334. 1815. 



Thallus tough, greenish gray to whitish, sparingly branched, the branches round 

 to flattened, much elongated and intertangled, soralia present; apothecia middle- 

 sized to large, 0.8-2 mm. across, sessile, the disk flat to slightly convex, black, 

 the exciple thin, colored like the thallus, finally disappearing; spores oblong- 

 fusiform, 20-26 X 5-8 fi. 



On rocks, southern California. 



4. Roccella Montagnaei Bel, Voyage Indes-Orient. 2: Crypt. 117. 1846. 



Thallus erect, greenish gray to ashy, dichotomously much-branched, the 

 branches short, more or less flattened, blunt or pointed, bearing numerous soralia; 

 apothecia middle-sized to large, 1-2 mm. across, sessile, the disk flat to slightly 

 convex, black, the exciple thin, colored like the thallus, finally disappearing; spores 

 oblong-fusiform, 26-32 p. 



On shrubs, southern California. (Description partly compiled from Nylander.) 



OTHER SPECIES REPORTED 

 Roccella difficilis Darb.— North America. 



67. Schizopelte T. Fries, Flora 58:143. 1875. 



Thallus foliose to fruticose, erect, more or less thickly lobed or branched, the 

 lobes or branches round, smooth to rough, the cortex of transversely extending, 

 cohering hyphae, a more or less distinct algal layer, the medullary tissue of longi- 

 tudinally extending hyphae; apothecia lateral or terminal, irregular, the disk 

 concave to flat, the exciple colored like the disk, soon disappearing, surrounded by 

 an irregular thalloid one; hypothecium dark brown; hymenium hyaline or brownish 

 above; paraphyses branched; asci clavate; spores 8, brown, oblong to fusiform, 

 3-many-septate. 



The algal host is Trentepohlia. 



1. Schizopelte calif ornica T. Fries, Flora 58:143, 144. 1875. 



Thallus composed of erect, clustered, whitish, rough to finally scaly, wrinkled, 

 round, distinctly branched lobes ; apothecia middle-sized to large, 2-8 mm. across, 

 subpedicellate, lateral and terminal, becoming fan-shaped or irregular, the disk 

 concave to rarely flat, dull black or thinly white-pruinose, the exciple thin, colored 

 like the thallus, becoming crenate; spores oblong, 3-6-septate, 18-24 X 5-7.5/*. 



On rocks and soil, California. 



