108 LICHENS OF THE STATE OF WASHINGTON 



regular; asci 1-2-spored; spores hyaline, oblong-ellipsoid, nonseptate, 

 82.0-155.1 X 28.0-68.0 fi. Thallus yellow then bright red with KOH. 



On bark or rock: Spokane Co.: Mt. Spokane, 5808 ft., 1931, 1486. 

 Wahkiakum Co.: Cathlamet, 1940, 2861. Clallam Co.: Olympic Hot 

 Springs, 1935, A. H. Smith 2125 (F). San Juan Co.: San Juan Island, 

 Roche Harbor, 1905, Frye (F) ; Orcas Island, Turtle Back Mountain, 

 1906, Fink 453 (W). Island Co. : Whidbey Island, /. M. Grant 3153 (F). 



The definite zonate margin and lack of the quinine taste help to dis- 

 tinguish this Perfusaria. 



5. Pertusaria pustulata (Ach.) Duby, Bot. Galhc. 2:673. 1830. 

 Porina pustulata Ach. Lichengr. Univers. 309. 1810. 



Thallus white, olive-buff (R), dark olive-buff (R), or cream-buff (R), 

 thin, smooth or rough, cracked and slightly warty. Apothecia 1 -several in 

 each wart, hemispherical or difform, 0.2-0.5 mm. in diameter, at first im- 

 mersed, then becoming globular with prominent ostioles, finally ostioles 

 unite to form black, flat disks; thalline margin concolorous with the 

 thallus, quite thick, irregular; asci 2-spored; spores hyaline, ellipsoid, 

 nonseptate, 70.5-85.0 x 30.0-40.0 /x. Thallus yellow with KOH. 



On bark: Washington Territory, Suksdorf 271 (T). Herre (1917) 

 reports this species, with some question, from Whatcom Co. 



6. Pertusaria velata (Turn.) Nyl. Lich. Scand. 179. 1861. 

 Parmelia velata Turn. Trans. Linn. Soc. London, 9:143. 1808. 



Thallus white or pale greenish white, thin, smooth or cracked, wrinkled 

 and folded, zonate at the margin. Apothecia 1 -several in each wart, warts 

 crowded, apothecia 0.3-1.0 mm. in diameter, immersed; disk pale yellow or 

 flesh-color (R), densely white pruinose, concave to flat; thalline margin 

 concolorous with the thallus, regular, thick, very rarely disappearing ; asci 

 1-spored, or rarely 2-spored; spores hyaline, oblong-ellipsoid, nonseptate, 

 184.0-230.0 X 42.0-60.0 /,».. Thallus shows no color change with KOH. 



On bark or rock : San Juan Co. : San Juan Island, Friday Harbor, trail 

 to Heaven, 1940, 3246. Kitsap Co.: Hidden Ranch near Bremerton, 213 

 ft., 1940, 3289. Clallam Co.: Ozette Lake, A. H. Smith 13433 (F). Grays 

 Harbor Co.: Westport, 1908, Foster 670b (F). 



The absence of white soredial heaps and the lack of any color change 

 with KOH characterize this Pertusaria, and separate it definitely from P. 

 multipuncta, with which it is sometimes confused. 



22. LECANORACEAE 



Thallus uniformly crustose, sometimes marginally lobed, subfoliose, 

 squamulose or rarely dwarf fruticose, often differentiated into cortex, 

 algal and medullary layers, but no differentiation in some species; at- 

 tached to the substratum by hyphal rhizoids or an umbilicus. Apothecia 



