126 HERRE 



Apothecia small or medium size, innate, urceolate, concave, soon 

 plane, finally emergent and sessile, the thin margin usually entire, 

 becoming minutely denticulate and wavy or lobulate ; disk dark red- 

 brown to red- black, smooth or becoming roughened; epithecium 

 lemon-yellow; paraphyses sub-conglutinate; hymenium pale bluish 



with I, the asci not tinged; spores broad, short-ellipsoid, -^ '— n- 



Rare; on a rocky clay bank in the foothills near Stanford Univer- 

 sity, with Acarospora bella. Collected on earth at Mission Dolores 

 by Bolander, but not occurring there now, as the locality has become 

 a thickly settled part of San Francisco. 



An earth and rock lichen of Europe and Western North America. 



4. ACAROSPORA FUSCATA (Schrad.) Arn. 



Lichen fuscatus Schrader, Spicil. Fl. Germ. 83. 1794. 



Acarospora. fuscata Arnold, 



Lecanora fuscata Tuck. Syn. N. Am. Lich. I: 203. 1882. 



Thallus indeterminate, of small to medium sized, appressed squa- 

 mules, angular, or when scattered or marginal more or less crenate- 

 lobate; blackish beneath; color varying from pale brown to very dark 

 chestnut; KOH -f CaCl202 reddish. 



Apothecia at first dot-Hke and depressed, then from concave becom- 

 ing plane, variously shaped, finally superficial with a more or less evi- 

 dent margin; from one to several in an areole; paraphyses agglutinate 

 at their dark brown tips; hymenium pale bluish or yellowish blue 



with I, the asci pale yellowish; spores M- 



Common on sandstone in the mountains. Found in the temper- 

 ate and arctic realms of Europe and America. 



5. ACAROSPORA RUFESCENS (Sm.) Th. Fr. 



Urceolaria rufescens Sm. Eng. Fl. 5: 173. 1795. 

 Acarospora rufescens Th. Fries, Lich. Scand. 215. 187 1. 

 Lecanora fuscata b. rufescens Tuck. Syn. N. Am. Lich. I: 203. 1882. 



Thallus of small, angular, flattened squamules, separated more or 

 less by fissures, not confluent; more rarely more or less contiguous, 

 larger, and somewhat lobate incised; color a very dark brown; 

 KOH-;CaCl202 -. 



