THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 121 



ish Museum, and with the specimens at Kew in the Leighton Her- 

 barium. 



At the time of naming Gyrophora diabolica Dr. Zahlbruckner had 

 not seen fertile specimens of G. polyrrhiza; later he obtained some 

 from Dr. Fries and saw at once the identity of the plants. 



ACAROSPORACE^E. 



Thallus crustaceous, scale-like, almost foliaceous, or obsolete, 

 without rhizoids; alga Pleurococcus or Protococcus. Apothecia en- 

 closed in thalline warts, from apparently pyrenocarpous globose, 

 and innate, to circular, sessile, or elevated sessile, solitary or grouped, 

 with proper or thalline margin; disk often very small or irregular; 

 asci multisporous, the spores very small, colorless, simple in our 

 species. 



KEY TO GENERA. 



A. Thallus obsolete or but little evident XXVI. Biatorella 



A A. Thallus of small or medium-sized scales or warts in which the 

 apothecia are innate . .XXVII. Acarospora 



XXVI. Biatorella (DeN.) Th. Fr. 



Biatorella De Notaris, Giorn. Bot. It. an. 2, t. 1: 192. 1846. 

 Biatorella Th. Fr., Gen. Heterol. Lich. 86. 1861. 



Thallus crustaceous, uniform or marginally lobed, or, in our 

 species, obsolete or very poorly developed. Apothecia circular 

 or nearly so, sessile or elevated, lecideine in our species, hypothe- 

 cium clear to dark; spores ellipsoid or globose, very small and thin- 

 walled. 



KEY TO SPECIES. 



A . Spores few, often only 8 i. revertens 



A A. Spores very numerous. 



B. Hypothecium clear 2. simplex 



BB. Hypothecium brown to brownish black 3. clavtis 



i. BIATORELLA REVERTENS (Tuck.) Herre. 



Sarcogyne Tuck. Genera Lichenum, 122. 1872. 

 Lecanora privigna d. revertens Tuck. Syn. N. Am. Lich. 1 : 204. 1882. 

 Thallus wanting. Apothecia lecideine, medium to large, from 



