THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 127 



Apothecia small or very small, one in each scale; irregular in form, 

 concave or plane, concolorous or darker than the thallus; becoming 



blackish brown; thecium blue with I; spores _ /* 



o D 



Abundant on rocks in the foothills, forming inconspicuous inde- 

 terminate dark blotches on them. Common in Europe and North 

 America. 



6. ACAROSPORA OBPALLENS (Nyl.) A. Zahlbr. 



Lecanora obpallens Nyl. with Hasse in Bull. Torrey Botan. Club. 24: 



446. 1897. 



Lecanora obpallens Nyl. Act. Soc. Sci. Fennic. 26: 31. 1900 (note). 

 Lecanora obpallens Hasse, Lichens So. Calif . ed 2 : 13. 1898. 

 Acarospora obpallens A. Zahlbruckner, Beihefte zum Botan. Cen- 



tralbl. 13: 161. 1902. 



Thallus of very small to small squamules, reaching a breadth of i 

 to 1.5 mm., often forming only a narrow margin to the apothecia, 

 thin, scattered and round or sometimes approximate and angulose, 

 convex, the surface more or less rugose; color typically pale to dark 

 reddish brown, but in our specimens mostly densely white pruinose, 

 often with a more or less roseate cast. 



Apothecia but one in an areole, immersed; disk concave to plane, 

 not more than i mm. broad, black or reddish, but usually densely 

 white pruinose; thalline margin prominent, thick, often wavy or 

 denticulate; epi thecium thin, more or less granulose, pale yellowish; 

 hypo thecium pale, thick; paraphyses hair-like and densely conglu- 

 tinate, dusky, paling with KOH, simple; their tips slightly thick- 

 ened; thecium pale, very broad, first bluish then soon reddish with 

 I; asci large, clavate or inflated clavate; spores oval or oblong, very 



1.4 - 2 

 numerous, r /* 



On soft crumbly sandstone at Laguna Creek, on the coast 9 miles 

 north of Santa Cruz. 



Previously collected only by Dr. Hasse in the Santa Monica range, 

 where it occurs on both rocks and earth. "The type occurs on earth 

 and the squamules are cervine brown; on sandstone the squamules 

 are suffused with white, interspersed with brown ones like the earth 

 form, or partially white suffused;" Hasse, in lilt. 



