LICHENS OF THE STATE OF WASHINGTON 115 



orange with KOH, no color change with CaOCla ; sometimes attached to 

 substratum by a central stalk. Apothecia circular or irregular in shape, 

 rather large and conspicuous, 1.0-3.5 mm. in diameter, subsessile to sessile; 

 disk chestnut brown or reddish brown, naked, flat to convex ; thalline mar- 

 gin concolorous with the thallus, incurved, flexuous, crenulate, rarely dis- 

 appearing; asci 8-spored; spores hyaline, broadly ellipsoid with rounded 

 ends, nonseptate, 10.5-14.0 x 6.6-8.0 /x. 



On rock: Ferry Co.: North of RepubHc, 2650 ft., 1931, 1407. Hillside 

 near Sanpoil, 2360 ft., 1940, 3143. 



12. Lecanora pacifica Tuck. Syn. N. Am. Lich. 191. 1882. 



Thallus dirty white or gray, crustose, thin and smooth, becoming rough 

 and warty, sometimes areolate; yellow with KOH but no color change 

 with CaOClo. Apothecia circular, 0.2-1.0 mm. in diameter, adnate to sub- 

 sessile; disk pale yellow, tawny (R), or brownish black, usually thin, flat 

 to convex, greenish yellow or white-pruinose ; thalhne margin thin, white, 

 persistent, crenulate, often flexuous; asci 8-spored; spores hyaline, ellip- 

 soid, nonseptate, 10.7-16.0 x 6.6-10.0 ii. 



On bark: Pacific Co.: Loomis Lake, 1931, 749. Clallam Co.: Lake 

 Sutherland, 590 ft., 1931, 1032. Kitsap Co. : Hidden Ranch near Bremer- 

 ton, 213 ft., 1931, 1764. King Co.: Edgewood, 300 ft., 1931, 1825. Kittitas 

 Co.: Easton, 2168 ft., 1931, 833. Yakima Co.: Dead Horse Hill, 4500 ft., 

 1931, 985. Klickitat Co.: Bickleton, 3200 ft., 1931, 1640. Spokane Co.: 

 Spokane, 1910, Bonser 41 (W). 



An abundant bark lichen but one is not always too sure of its identity. 



U. Lecanora pallida (Schreb.) Rabh. Deutschl. Krypt. Fl. 2:34. 1845. 

 Lichen pallidiis Schreb. Spicil. Fl. Lips., 133. 1771, 



Thallus white, pale yellow, or deep olive (R), crustose, thin or thicker, 

 smooth or rough and warty ; yellow then red with KOH, no color change 

 with CaOClg. Apothecia circular, 0.5-3.0 mm. in diameter, adnate to sessile ; 

 disk buff or pale reddish brown, white-pruinose, tumid, flat to convex; 

 thalline margin concolorous with the thallus, at first thick, becoming crenu- 

 late and flexuous, sometimes disappearing; asci 8-spored; spores hyaHne, 

 ellipsoid, nonseptate, 9.0-18.0 x 6.0-11.0 fi. 



On bark : No doubt collected by the writer, but so difficult to distinguish 

 from Lecanora pacifica Tuck, that I am not reporting any definite collec- 

 tions. Thurston Co.: Gate, 1912, Foster 1989 (F). Olympic Mountains, 

 Elwha Valley, 1800 ft., 1907, Frye 52 (F). Washington Territory, Cascade 

 Mountains, 1883, Brandegee 57 (S). 



Lecanora pacifica Tuck, and Lecanora pallida (Schreb.) Rabh. are very 

 similar ; L. pallida has somewhat longer spores, it grows on smooth bark, 

 and the thallus never becomes areolate. Yellow then red with KOH should 

 separate L. pallida from L. pacifica, but I do not have too much confidence 

 in chemical tests, unless combined with morphological characters. 



