LICHENS OF THE STATE OF WASHINGTON 135 



18. Parmelia saxatilis (L.) Ach. Meth. Lich. 204. 1803. 

 Lichen saxatilis Linn. Sp. PI. 1142. 1853. 



Thallus ivory yellow (R), deep olive-buff (R), tawny-olive (R), 

 cream color (R), or rarely brown, cartilagineous-membranaceous, reticu- 

 late-rimose, lacunose, lobes narrow, sinuose, often pinnately many-cleft, 

 tips retuse, crenate or truncate, often brownish, slightly isidiose; below 

 black, tips brownish, with abundant, black rhizoids. Apothecia rare, 1-6 

 mm. in diameter, sessile; disk chestnut-brown, concave; thalline margin 

 entire, subcrenate or irregular ; asci 8-spored ; spores hyaline, ellipsoid, non- 

 septate, 14.0-19.8 X 8.0-10.5 IX. 



On bark, wood or rock, often on moss over rock : San Juan Co. : San 

 Juan Island, Pt. Caution, 1940, 3279. Pacific Co.: Loomis Lake, 1931, 546. 

 kitsap Co. : Hidden Ranch, near Bremerton, 213 ft., 1930, 768. Thurston 

 Co. : Grand Mound, 1940, 2979. Chelan Co. : Merritt, 2186 ft., 1931, 1087a. 

 Kittitas Co.: South Cle Elum, 3000 ft., 1931, 876a. Klickitat Co.: Golden- 

 dale, 2000 ft., 1931, 1691. Ferry Co. : Laurier, 1644 ft., 1931, 1418. Clallam 

 Co. : Olympic Hot Springs, 2000 ft., 1914, Foster 2866 (W). Grays Harbor 

 Co. : Montesano, 1919, /. M. Grant 3006 (F). San Juan Co. : Orcas Island, 

 1904, Frye (F). Spokane Co. : Spokane, 1908, T. A. Bonser 53 (W). 



A common species widely distributed. It is easily recognized by the 

 reticulate-rimose thallus, the lack of soredia separates it from Parmelia 

 sulcata. 



19. Parmelia saxatilis var. Aisoni Del. in Duby, Bot. Gallic 2 :602. 1830. 



Thallus densely covered with grayish-brown isidia, so dense at times as 

 to entirely replace the thallus, otherwise like the species; apothecia rare. 

 Medulla reddish orange with paraphenylenediamine. 



On bark, soil, and rock : San Juan Co. : San Juan Island, Friday Harbor, 

 1940, 3242; Mt. Constitution, Orcas Island, 1928, 2109. Pacific Co. : Long 

 Beach, 1940, 2759. King Co. : Edgewood, 300 ft., 1940, 3086. Chelan Co. : 

 Rainbow Trail, 3600 ft., 1931, 1270. Klickitat Co.: Goldendale, 2000 ft., 

 1931, 1697. Ferry Co.: Laurier, 1644 ft., 1931, 1416. Grays Harbor Co.: 

 Aberdeen, Foster 922 (F) ; Montesano, 1919, /. M. Grant 3014 (F). 

 Clallam Co.: Sequim, 1916, /. M. Grant 847 (F). Spokane Co.: Spokane, 

 1906, T. A. Bonser (F). 



Rather common and widely distributed, similar in appearance to Par- 

 melia rudecta, from which it can easily be separated by the red or reddish 

 orange coloration of the medulla, when treated with paraphenylenediamine, 

 the medulla of Parmelia rudecta shows no color change with paraphenyl- 

 enediamine. 



20. Parmelia sulcata Taylor in Mack., Fl. Hibern. 2:145. 1836. 

 Parmelia saxatilis var. sulcata (Taylor) Linds. Trans. Roy. Soc. of 



Edinburgh, 22 :228. 1859. 



