LICHENS OF SANTA CRUZ PENINSULA 369 



abundant along or near the margin ; color in the field usually a 

 glaucous green ; herbarium specimens vary from bluish or 

 greenish drab or gray to dull rufous brown ; beneath covered 

 with a pale brown fleece which becomes darker centrally ; 

 white concave cyphels rather sparingly present. Sterile. 



On tree trunks, growing w'ith other Stictas. 



Not uncommon along the summit of the range at an altitude 

 of 2400 feet and above. 



Lichen limbaltis Smith, in Eng. Bot. i6 : -pi. iio^. 1802. 

 Sticta limbata Ach. Meth. Lich. 280. 1803. 



4. STICTA ANTHRASPIS Acharius. 



Thallus medium to large, rounded or irregular, usually con- 

 spicuously pitted and reticulate ; texture leathery or parchment- 

 like ; short and wide-lobed, margin sinuous, rounded and cre- 

 nate, or often more narrowly and deepl}'- cut, even becoming 

 lacerate ; ridges of surface often covered with confluent gray 

 soredia ; color usually brown, but varying from green to russet 

 or chocolate ; sometimes darkening ; beneath covered with a 

 pale dense fleece, becoming darker toward the center or some- 

 times entirely dark or dingy black ; thickly sprinkled with small 

 white convex cyphels. Apothecia scattered, becoming very 

 abundant ; disk red-brown, sometimes dark or black ; flat, 

 finally convex and excluding the prominent, entire or denticu- 

 late margin. 



On trees, roots and occasional on old fences ; rarely on earth. 



Very abundant in the mountains at all elevations and extend- 

 ing downward in the foothills to about 200 feet. Usually sterile 

 at lower elevations but luxuriant and fruitful in San Mateo 

 Canon at not more than 200 feet. 



Often attaining a diameter of 10 or 12 inches, being next in 

 size to Sticta pulmonaria. 

 Sticta anthraspis Ach. Meth. Lich. 280. 1803. 



5. STICTA SCROBICULATA (Scop.) Acharius. 

 Thallus medium, round or sub-orbicular, leathery, short- 

 lobed ; surface more or less pitted or wrinkled ; thickly sprin- 

 kled with gray soredia ; lobes rounded, imbricate, but little in- 

 cised, more or less crenate ; color of herbarium specimens dull 



