THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 227 



CALOPLACACE^. 



Thallus crustaceous and uniform or marginally lobed, or rarely 

 podetia-form or fruticose; without rhizoids, usually without cortex; 

 alga Pleurococcus. 



Apothecia circular, innate or sessile, with a thalline margin, or a 

 proper margin which does not enclose alga;; epithecium granular, 

 usually containing chrysophanic acid and becoming purple or violet 

 with KOH. Paraphyses simple, septate, usually with enlarged tips; 

 spores usually 8, colorless, rarely tri- or quadrilocular, mostly polar- 

 bilocular, the cells connected by a narrow tube or isthmus; rarely 

 the spores are simple; these species are separated from Lecidea or 

 Lecanora by the endobasidial sterigmata. 



KEY TO THE GENERA. 



A . Apothecia with proper margin, not containing algae, 



biatorine or lecideine LVII. Blastema 



A A. Apothecia with thalline margin enclosing algae, 



lecanorine LVIII. Caloplaca 



LVII. Blastema (Mass.) Th. Fr. 



Blastema Massalongo, Monog. Lich. Blast. loi. 1853, i^ part. 

 Blastema Th. Fries, Gen. Heterol. Europ. 87. 1861. 



Thallus crustaceous, uniform to powdery, granular, or areolate, 

 without cortex. 



Apothecia circular, innate or sessile, light colored or dark with 

 proper margin which does not enclose algae; asci 4-16 spored; 

 spores polar-bilocular, ellipsoid or oblong, colorless. 



A widely distributed genus of about 60 species, occurring on bark, 

 wood, mosses, and rocks. But one species certainly occurring with 

 us. 



I. BLASTENIA FERRUGINEA (Huds.) Arn. 



Lichen ferruginens Hudson, Flora Anglica, 444. 1762. 



Blastenia ferruginea Arn. 



Placodium ferruginea Tuck. Syn. N. Am. Lich. I: 177. 1882. 



Thallus at first uniform but soon rough, chinky or fissured, granu- 

 lar to warty; determinate and sub-orbicular to effuse; from ashy gray 

 to whitish. 



Apothecia small to medium, plane to convex, rust-colored to red; 



