86 HERRE 



ii. LECIDEA CRUCIARIA Tuck. 

 Lecidea cruciaria Tuck. Syn. N. Am. Lich. II ; 67. 1 888 ; Santa Cruz. 



Thallus effuse, thin to very thin, of minute scurfy scales, or closely 

 areolate ; white, more or less plainly marked by tortuous black hypo- 

 thalline lines, best seen when wet; medulla with I-; hypothallus 

 black. 



Apothecia numerous, small to medium, sessile, flat; disk black, 

 opaque, from smooth becoming minutely roughened; from flat 

 becoming moderately convex and the originally stout, wrinkled, 

 at length flexuous margin disappearing; epithecium bluish or green- 

 ish black, with KOH becoming sooty brownish black; paraphyses 

 coherent, capitate, with bluish black apices; asci clavate and in- 



16 



flated-clavate, - - /*; hypothecium pale greenish brown and dark- 

 50 



4.8 - 7^ 

 ening; spores ellipsoid, ~^ ^ /'; hymenium blue with I. 



Tuckerman's specimens were from Santa Cruz, on sandstone. I 

 have found it, however, only on Monterey shale, along the coast for 

 50 miles north of Santa Cruz and extending back into the ' 'chalk 

 hills" ten miles or more from the coast, at altitudes from 50 to 1400 

 feet. 



12. LECIDEA LITHOPHILA (Ach.) Th. Fr. 



Lecidea lapicida i. lithophila Ach. Lich. Univ. 160. 1810. 

 Lecidea lithophila Th. Fr. Lich. Scand. II: 495. 1874. 

 Lecidea pruinosa Tuck. Syn. N. Am. Lich. II: 66. 1888. 

 Lecidea pruinosa Macoun, Cat. Canadian Plants, VII: 154. 1902. 



Thallus thin, tartareous, of small ash-colored squamules, loosely 

 approximate; the rimose-areolate character of the thallus mentioned 

 by various authors not marked; the black -hypo thallus but little 

 evident; KOH- ; CaCl 2 O 2 -. 



Apothecia sessile, \ to f-mm. wide; disk concave to flat, black, 

 more or less light gray pruinose, the thin black margin finally dis- 

 appearing; epithecium brown; paraphyses simple, erect, coherent; 

 hypothecium almost colorless; asci clavate; spores rarely seen, 



6-7 



ellipsoid/- - j". 



9-iS 



