LICHENS OF THE STATE OF WASHINGTON 21 



quently curved and flexuous, slightly immersed to adnate ; disk black, flat, 

 closed to slightly open; proper margin dull black, rarely with a spurious 

 thalline margin ; hypothecium yellowish to brownish black ; spores hyaline, 

 fusiform or ellipsoid-dactyloid, 3-7-septate, 16.0-24.0 x 5.0-7.0 fx. 

 On bark: Thurston Co. : Gate, 1911, Foster 1911 (F). 



3. Opegrapha lichenoides Pers. Ann. Bot. Usteri 7:30. 1794. Opegrapha 

 varia var. notha Fries. 



Thallus white or grayish-white, smooth, thin. Apothecia rather short, 

 oblong, almost circular, 0.2-1.0 x 0.2-0.5 mm., subsessile; disk dull black, 

 soon open, swollen and obliterating the proper margin ; hypothecium dark 

 reddish brown; spores hyaline becoming brownish, fusiform, 4-5-septate, 

 23.2-28.0 X 3.0-8.0 /.. 



On bark : Pierce Co. : Mt. Rainier, White River Camp, 3900 ft., 1940, 

 3106; trail to Mowich Lake, 3500 ft., 1940, 3063b. Thurston Co.: Gate, 

 1912, Foster (F). 



This species is rather easily distinguishable by the swollen disk. 



4. Opegrapha protuberans (Stirton) Zahlbr. Cat. Lich. Univ. 2:233. 1924. 

 0. prosiliens Stirton Grevillea 3 :36. 1874. 



Thallus white or whitish, thin to very thin, at times almost entirely 

 within the substratum. Apothecia 0.5-2.0 x 0.1-0.2 mm., linear, oblong or 

 ovoid, rarely almost circular, often very irregular in shape, partly immersed 

 to adnate ; disk black, very narrow, usually only a crevice, scarcely visible ; 

 proper margin black, broad and rounded; hypothecium dark brown to 

 black ; spores hyaline, elliptic-fusiform, 3-septate, third cell the largest, with 

 a gelatinous halo, 13.2-22.4 x 4-8.3 jx. 



On bark: San Juan Co. : Turn Island, 1928, 1989; Brown Island, 1940, 

 3256. King Co.: Alki Point, 1912, Foster 2183 (F). Clallam Co.: Pt. 

 Angeles 1911, Foster (F). 



5. Opegrapha varia Pers. Ann. Bot. Usteri 7:30. 1794. 



Thallus white to grayish green, thin, smooth to rough, chinky or pow- 

 dery, rarely disappearing within the substratum. Apothecia dull black, 

 0.5-2.0 X 0.2-0.3 mm., oblong to ovoid, immersed to adnate, straight to 

 slightly curved at maturity ; disk open ; proper margin black, thin, promi- 

 nent, inflexed, usually disappearing; hypothecium brownish black; spores 

 brown when mature, ellipsoid, 3-5-septate, rarely 7-septate, 16.5-32.8 x 

 4.3-8.4 IX. 



On bark : San Juan Co. : Turn Island, 1928, 1990. Pacific Co. : Loomis 

 Lake, 1931, 743. Grays Harbor Co.: 1911, Foster 1477 (F). Clallam Co.: 

 Mt. Angeles, 1911, Foster 1759 (F). Whatcom Co. : Nooksack River, 1914, 

 Herre (F). King Co. : North Bend, 1902, Frye 68 (F). 



11. Graphis Adans. Fam. PI. 2 :11. 1763. 



