LICHENS OF THE STATE OF WASHINGTON 107 



On bark : San Juan Co. : San Juan Island, Friday Harbor, 1928, 2025. 

 King Co. : Edgewood, 300 ft, 1940, 3087. Thurston Co. : Grand Mound, 

 1940, 2942; Gate, 1940, 2969. Clallam Co. : Sequim, 1915, /. M. Grant 419 

 (F). Island Co.: Whidbey Island, Langley, 1920, /. M. Grant 3043. 



The quinine taste and the color reactions of this lichen make it an easy 

 one to identify. 



2. Pertusaria ambigens (Nyl.) Tuck. Proc. Am. Acad. Arts & Sci. 12:176. 



1877. 

 Lecanora ambigens Nyl. Act. Soc. Sci. Fenn. 7 :449. 1863. 



Thallus pale greenish gray or darker gray, smooth becoming rough and 

 warty. Apothecia usually only one in each wart, 0.2-1.0 mm. in diameter, 

 sessile or somewhat elevated; disk pale yellow, flesh color (R), or green, 

 sometimes gray pruinose, concave to flat ; thalline margin concolorous with 

 the thallus, irregularly crenate, often torn and separated to form several 

 layers; asci 8-spored; spores hyaline, ellipsoid, nonseptate, 16.5-21.4 x 

 9.9-12.0 II, with rather a wide epispore. Thallus yellow with KOH. 



On bark : Clallam Co. : Elwha River Road, 250 ft., 1940, 2897a. San 

 Juan Co.: San Juan Islands, 1906, E.T.&S. A.Harper 237 (F). King Co.: 

 Summit, 1907, Foster 668y2 (F). 



3. Pertusaria leioplaca (Ach.) DC. in Lam. & DC. Fl. Franc. 3rd ed., 



6:173. 1815. 

 Porina leioplaca Ach. Kgl. Vetensk-Akad. Nya Handl. 159. 1809. 



Thallus white, pale greenish gray, or light buff (R), thin, smooth, or 

 slightly cracked, rough and scaly, sometimes partly developed within the 

 substratum, apothecial warts rather numerous, scattered, smooth and 

 prominent, with several apothecia in each wart. Apothecia 0.2-0.4 mm. in 

 diameter, depressed at the center ; disk lacking, ostioles black, punctiform, 

 often indistinct; thalline margin irregular, at times disappearing; asci 

 4-6-8-spored ; spores hyaline to pale brown, ellipsoid, nonseptate, 44.0- 

 184.0 X 22.0-56.0 ix, a great variation in spore sizes. Thallus faintly yellow 

 with KOH. 



On bark or rock: Clallam Co.: Port Angeles, 1914, Foster 2648 (F). 

 Island Co. : Whidbey Island, Langley, 1923, /. M. Grant 216e (F). Thurs- 

 ton Co.: Gate, 1913, Foster 2012 (W). 



4. Pertusaria multipuncta (Turn.) Nyl. Lich. Scand. 179. 1861. 

 Variolaria multipuncta Turn. Trans. Linn. Soc. London, 9:137. 1808. 



Thallus pale olive-buff (R), deep olive-buff (R), warm buff (R), or 

 gray, rough, warty and wrinkled, indistinctly zonate at the margin. Apo- 

 thecia 1 -several in each wart, 0.2-0.8 mm. in diameter, immersed. Apothecia 

 closed at first, then with black ostioles, and finally becoming white soredial 

 heaps; disk, if present, black, white, or pale yellow; thalline margin ir- 



