THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 45 



2. DERMATOCARPON HEPATICUM (Ach.) Th. Fr. 



Endocarpon hepaticum Acharius, Lich. Univ. 298. 1810. 

 Dermatocarpon hepaticum Th. Fr. Lich. Arct. 255. 1860. 



Thallus of small, rounded, closely adnate squamules, these becom- 

 ing wavy; margin more or less incised or crenate, upturned, blacken- 

 ing; usually distinct, but sometimes slightly imbricate; color varying 

 from bright reddish brown to chestnut, and dull dusky brown. 



Apothecia numerous, immersed, the ostioles minute, becoming pro- 

 tuberant with black margin; spores oval, JJL. 



12 14 



On bare earth or in crevices of rocks in the foothills and mountains. 

 In Tuckerman Herbarium (Bolander's collection) from San Fran- 

 cisco and Oakland. Common on calcareous soil throughout the 

 North Temperate Zone. 



Section ENTOSTHELIA. 



Thallus foliaceous, attached by a central umbilicus. 



3. DERMATOCARPON MINIATUM (L.) Mann. 



Lichen miniatus Linn. Sp. PL 2: 1149. 1753. 



Dermatocarpon miniatum Mann, Lich. in Bohemia observ. p. . 1826. 



Dermatocarpon miniatum Herre, Proc. Wash. Acad. Sci. 7 : 394. 1906. 



Thallus medium to large, smooth, coriaceous, one-leaved or lobate, 

 the margin rounded, undulate, or crenate, and more or less recurved; 

 attached by an umbilicus; color whitish to bluish gray or occasionally 

 brownish; sometimes granulose pruinose; beneath varying from a 

 bright to a dark brown or black, smooth or minutely pustulate. 



Apothecia very numerous, minute, scattered, immersed in the 

 thallus; opening by small dark or brown pores, which appear as specks 

 thickly distributed over the entire surface. Spores ellipsoid, 



*rj* 



9i - J 7 



On rocks, in shaded or damp situations. A common and con- 

 spicuous lichen throughout the foothills and to the summit of the 

 Santa Cruz range, the thallus reaching a diameter of more than four 

 inches in specimens from San Bruno Mountain. Common in the 



