82 HERRE 



Common in the foothills on sandstone and occasional in the moun- 

 tains on the same substratum, up to 3000 feet. Specimens collected 

 by Bolander at Mission Dolores, San Francisco, and at Ukiah, were 

 named Biatora glebulosa by Tuckerman. 



Described by Dr. Zahlbruckner from specimens collected by Dr. 

 Hasse on Mt. San Gabriel, in southern California. 



5. LECIDEA COARCTATA (Sm.) Nyl. 



Lichen coarctatus Smith, English Bot. S: 8. t. 534. 1795. 

 Lecidea coarctata Nyl. Lich. Scand. 196. 1861. 

 Biatora coarctata Tuck. Syn. N. Am. Lich. II: 15. 1888. 

 Parmelia elacista Ach. Meth. Lich. 159. pi. $.f. 4. 1803. 

 Lecanora ornata Sommerf. Suppl. Fl. Lapp. 92. 1826. 



Thallus whitish or gray, areolate, scattered; thin or disappearing 

 or forming a continuous, fissured crust; areolae quite small, the largest 

 scarcely exceeding f mm. in width, furfuraceous, convex, and mostly 

 approximate; the red reaction of authors with CaCl202 is not seen in 

 our plant. 



Apothecia sessile and sub-innate, small or minute; disk reddish 

 brown, flat, finely pap Hate, with a thin, slightly elevated margin, 

 which is concolorous or a little darker, persistent; frequently with a 

 coarctate, spurious, pulverulent thalline margin; paraphyses indis- 

 tinct, thread-like and twining; hypothecium and epithecium color- 

 less; thecium blue or brown with I; asci oblong saccate; spores ovoid- 



7-5 ~~ IJ 



elb'psoid, /<. 

 17-25 



On sandstone and earth in the foothills and mountains. The 

 forma elacista (Ach.) characterized by the effuse, very thin, scurfy, or 

 almost entirely disappearing thallus, occurs on clay, along the sum- 

 mit of the first ridge east of Los Gatos, at about 1500 feet elevation, 

 and on sandstone at 2000 feet elevation on Castle Rock Ridge. 



The forma ornata of authors, characterized by a more luxuriant 

 development of the thallus, with marginally crenate, flat to convex 

 squamules, occurs on sandstone in the foothills. 



A variable and quite common lichen of Europe and North Amer- 

 ica. 

 (coarctata, narrow or appressed, from the appearance of the false 



thalline margin.) 



