THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 9 1 



spicuous black hypothalline lines, and the yellowish or greenish- 

 brown color. 



Apothecia small or minute, numerous, scattered, black or rusty- 

 black, sessile or sub-immersed, the disk concave to plane, finally 

 moderately convex, with a thin, erect, entire margin which is finally 

 excluded; epithecium dusky greenish; thecium blue with I; hypo- 



7 - 8i 

 thecium brown ; spores ellipsoid or ovoid ■ !J- 



Common on the bark of various trees from the foothills to the 

 summit of the highest peaks. A European lichen particularly 

 abundant in the Mediterranean region. We have both the typical 

 plant and the forma geographica. 



20. LECIDEA PARASEMA Ach. 



Lichen parasemus Ach. Lich. Suec. Prodr. 64. 1798. 



Lecidea parasema Ach. Meth. Lich. 35. 1803. 



Lecidea enteroleuca e. achrista Tuck. Syn. N. Am. Lich. II: 80. 1888. 



Thallus effuse, thin, contiguous and rather smooth, or tartareous, 

 becoming chinky or dispersed and made up of minute scurfy or 

 warty areoles; whitish, gray, ashen, to brownish ash color; KOH — 

 or sometimes yellowish; CaCl202 — ; hypo thallus indistinct or ab- 

 sent. 



Apothecia small, sessile, black; disk at first flat and often more 

 or less tuberculate, with an evident entire margin which is some- 

 times flexuous; soon convex and tumid, rugulose or papillate, the 

 margin finally obsolete; epithecium bluish black; paraphyses free, 

 their bluish black tips abruptly thickened; hypothecium faintly 

 colored to brown; asci clavate, thecium blue with I; spores oblong 



6-8 

 ellipsoid, ^^-3^ /.. 



A variable bark lichen occurring throughout our territory and 

 found all over Europe and North America; one of the commonest 

 species in most temperate regions, but with us less abundant than 

 the closely related Lecidea olivacea. 



21. LECIDEA LATYP^A Ach. 



Lecidea latypcBa Ach. Meth. Lich. SuppL 10. 1803. 



Lecidea enteroleuca Tuck. Syn. N. Am. Lich. II: 79. 1888, in part. 



Proc, Wash, Acad. Sci., May, 1910. 



