THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 4! 



6 - 8i ii - 13^ .8-15 



containing a large oil drop, ^ _ ig j, ^ _ ^ /*, and ^-^ /*; 



12 1^ 



according to Nylander, - -p. 



On sandstone in the foothills and mountains. Common in Europe, 

 Africa, and North America. 



4. VERRUCARIA MURALIS Ach. 



Verrucaria muralis Acharius, Meth. Lich. 115. 1803. 

 Verrucaria muralis Tuck. Gen. Lich. 269. 1872. 

 Verrucaria muralis Jatta, Lich. Syll. Ital. 1325. 1900. 



Thallus thin, effuse, and disappearing, ashen or gray in color, of 

 minute granules. 



Apothecia, very small, scattering, black, pruinose or naked, hemis- 

 pherical, rather prominent; the ostiolum very minute, hardly visible 

 under the lens; perithecium dimidiate, black; amphithecium pale 

 brown or yellowish; hymenial gelatine blue with I; spores ellipsoid, 



colorless and pale yellowish, p. 



Rarely on sandstone on the highest peaks. Generally distributed 

 over Europe and North America. 



5. VERRUCARIA MELAS Herre, new species. 



Thallus thin or very thin, effuse, microscopically areolate and 

 intricately fissured, appearing to the naked eye as a daub of dead 

 black paint; KOH- ; CaCl 2 O 2 -- 



Apothecia not numerous, at first low and covered by the thallus, 

 becoming more prominent and emergent, hemispherical, finally sessile 

 and sub-globose, the apical portion then irregularly depressed and the 

 ostiolum comparatively large; perithecium entire, black; asci oval, 

 clavate, and pear-shaped, the hymenial gelatine blue with I; spores 



ir . , 8i - 12} 

 ellipsoid, - . 



19* - 27 ^ 



Rare; on rocks a few feet above the sea at Point Lobos, San Fran- 

 cisco, associated with Arthopyrenia halodytes. 



Strongly resembling Verrucaria maura in general appearance, but 



