LICHENS OF THE STATE OF WASHINGTON 63 



Thallus olive brown, grayish green, more often chestnut-brown, 

 squamulose, squamules rather large, smooth, somewhat shiny, concave, 

 undulate, irregularly lobed, somewhat imbricated, often ascending at the 

 edges; below gray or white. Apothecia clustered often confluent, 0.8-1.5 

 mm. in diameter, sessile, elevated ; disk black with often a greenish tinge, 

 convex or globose ; proper margin lighter in color and soon disappearing ; 

 hypothecium pale brown or reddish brown; paraphyses conglutinate ; asci 

 8-spored; spores hyaline, rare, ovoid-ellipsoid, nonseptate, 10.0-14.0 x 

 6.9-7.0 fi. 



On soil: Pierce Co.: Chinook Pass, 5440 ft, 1931, 1557. Yakima Co.: 

 Rattlesnake Canyon, 2000 ft., 1931, 1536. Chelan Co.: Beaver Summit, 

 2800 ft., 1931, 1335; butte, near Twisp, 1700 ft., 1931, 1459. Whitman 

 Co. : Pullman, 2550 ft., 1577. Washington Territory, Cascade Mountains, 

 1883, Brandegee 41 (T). 



This is rather a distinctive lichen, because of the large squamules with 

 upturned edges, showing the gray or white under surface. 



Z2.Lecidea lurida (Dill.) Ach. Meth. Lich. 77. 1803. 



Lichen luridus Dill, in Wither. A Bot. arrang. Brit. PI. 2:720. 1776. 

 Biatora lurida (Dill.) Fries. 

 Psora lurida (Dill.) Lam. and DC. 



Thallus some shade of brown, often lurid brown or Mars Brown (R), 

 squamulose, squamules smooth or slightly rough, rounded, adnate, cre- 

 nately lobed, procumbent, imbricated; below pale yellow or light brown. 

 Apothecia circular, scattered or sometimes clustered, 0.1-2,0 mm. in diam- 

 eter, adnate; disk sometimes concolorous with the squamules, often red- 

 dish-brown or black, flat to convex ; proper margin brown or black, obtuse, 

 disappearing ; hypothecium yellowish brown or brown ; paraphyses coher- 

 ent, tips reddish-brown ; asci 8-spored ; spores hyaline, oblong-ovoid, non- 

 septate, 11.4-16.0 x 5.0-7.6 IX. 



On rock or soil: Yakima Co.: Rattlesnake Canyon, 2000 ft., 1931, 

 1547a. Chelan Co. : butte near Twisp, 1700 ft., 1931, 1462. 



ZZ.Lecidea ostreata (Hofifm.) Schaer. Lich. Helvet. Spicil. sect. 3. 110. 

 1828. 



Psora ostreata Hoffm. Deutschl. Fl. 163. 1796. 

 Biatora ostreata (Hoffm.) Fries. 



Thallus pale tawny, grayish olive (R), or light fawn color (R), 

 squamulose, squamules small, smooth, flat to ascending, imbricated or often 

 scattered, crenately lobed, sometimes much reduced to glebous scales; 

 below white often powdery. Apothecia circular, 0.5-1.2 mm. in diameter, 

 adnate ; disk black, slightly white pruinose, flat ; proper margin gray, soon 

 becoming black, rather thick, flexuous; hypothecium thick, dark brown; 

 paraphyses colorless, coherent; asci 8-spored; spores hyaline, oblong- 

 ellipsoid, 8.0-12.0 X 2.5-3.0 /.. 



