LICHENS OF THE STATE OF WASHINGTON 103 



Thallus grayish green, thin, and evanescent, sometimes a few granules 

 scattered around the apothecia. Apothecia circular to somewhat angular, 

 0.5-2.0 mm. in diameter, adnate; disk dull black pruinose, when moist 

 reddish black, flat; proper margin concolorous with the disk, entire or 

 irregular, hypothecium yellow ; spores hyaline, ellipsoid-oblong, nonseptate, 

 3.6-6.0 X 1.0-2.0 ^. 



On rock: Stevens Co. : Boyds, 1470 ft., 1931, 1448. 



A rather inconspicuous rock lichen, perhaps the reason it has not been 

 collected more often. However, the pruinose disk separates it very definitely 

 from other Biatorellas. 



2. Biatorella simplex (Davies) Branth & Rostr. Bot. Tidssk. 3:241. 1869. 

 Lichen simplex Davies Trans. Linn. Soc. London 2:283. 1793. 

 Lecanora privigna (Ach.) Nyl. 



Thallus fine, scurfy, and soon evanescent. Apothecia circular or vei/ 

 irregular in shape, crowded or scattered, 0.2-0.5 mm. in diameter, adnate 

 or subsessile; disk brown or dull black, flat; proper margin concolorous 

 with the disk, elevated, turgid; hypothecium hyaline or yellowish; spores 

 hyaline, oblong-ellipsoid, nonseptate, 3.6-6.0 x 1.0-2.0 ix. 



On conglomerate rock or sandstone : Chelan Co. : Beaver Summit, 

 2800 ft., 1931, 1104. Cascade Mountains, 1925, /. M. Grant (WTU). 



3. Biatorella testudinea (Ach.) Mass. Ricerch. Auton. Lich. 131. 1852. 

 Lecidea cechumena var. testudinea Ach. Kgl. Vetensk.-Akad. Nya 

 Handl. 232. 1808. 



Lecidea morio Fries. 



Thallus yellowish or copper color, somewhat shiny, crowded, flat, angu- 

 lar areoles, marginally lobed, on a black hypothallus, which makes this 

 lichen appear black to the naked eye. Apothecia circular or angular, 0.3-1.0 

 mm. in diameter, immersed ; disk black, flat to convex ; proper margin con- 

 colorous with the disk, black, thin, flexuous, becoming indistinct ; hypothe- 

 cium hyaline or brownish red; spores hyaline, spherical or ellipsoid, non- 

 septate, 3.3-4.0 X 2.0-3.0 fi. 



On rock : Whatcom Co. : Ruth Mountain, 6800 ft., 1928. L. Sunquist 

 1923 (W). 



This alpine lichen can be identified easily by the very black hypothallus. 



4. Biatorella jossarum (Duf.) Th. Fr. Lich. Scand. 1:397. 1871-74. 

 Lecidea fossarum Duf. in Fries Lichenogr. Eur. Reform. 264. 1831. 

 Biatora fossarum (Duf.) Mont. 



Thallus pale greenish gray, thin, scurfy, scattered or compacted into a 

 crust. Apothecia circular, 0.5-1.0 mm. in diameter, adnate; disk pale yellow, 

 tawny (R), reddish brown, convex becoming hemispherical; proper 

 margin disappearing early; hypothecium brownish yellow ; spores hyaUne, 

 oblong, nonseptate, 5.0-11.0 x 3.0 /*. 



