THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA I57 



AA. Always sterile. 



B. Upper surface covered with dense black isidia 2. fuliginosa 



BB. Surface smooth; marginally sorediate 3. limbata 



I. STICTA ANTHRASPIS Ach. 



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



Sticta anthraspis Tuck. Syn. N. Am. Lich. I: loi. 1882, 



Sticta anthraspis Herre, Proc. Wash. Acad. Sci. 7: 369. 1906. 



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

 uously pitted and reticulate; texture leathery or parchment-like; 

 short and wide-lobed, margin sinuous, rounded and crenate, or often 

 more narrowly and deeply cut, even becoming lacerate; ridges of 

 surface often covered with gray confluent soredia; color usually 

 brown, but varying from green to russet or chocolate, or even darker; 

 beneath covered with a dense pale fleece, which becomes darker 

 toward the centre or sometimes is entirely dark or dingy black; 

 thickly sprinkled with small white convex cyphels. 



Apothecia medium to large, scattered, becoming very abundant^ 

 the disk red-brown, or darkening and finally black; flat, finally con_ 

 vex and excluding the prominent, entire or denticulate margin- 



7.5 — 10 



spores straight, colorless, 2-5 locular, i^. 



24 - 34.25 



On trees, roots, and occasionally on old fences; rarely on earth or 

 sandstone. Very common in the mountains at all elevations and 

 extending downward in the foothills to about 200 feet. Usually 

 sterile at the lower elevations, but in deep shady cafions luxuriant and 

 fertile at not more than 200 feet. Often attaining a diameter of 10 

 or 12 inches. 



Confined to the west coast of the United States. 



2. STICTA FULIGINOSA (Dicks.) Ach. 



Lichen fuliginosus Dickson, Brit. Crypt. 1: 13. 1785. 



Sticta fuliginosa Ach. Meth. Lich. 281. 1803. 



Sticta fuliginosa Tuck. Syn. N. Am. Lich. I: 99. 1882. 



Sticta fuliginosa Herre, Proc. Wash. Acad. Sci. 7: 368. 1906. 



Thallus leathery, more or less round-lobed; lobes short, wrinkled 

 and pitted, the margin entire, sinuous or somewhat crenate; color 



