LICHENS OF THE STATE OF WASHINGTON 177 



Usually on rocks, rarely on old wood or trees: Pacific Co.: Long 

 Beach, 1940, 2758. Clallam Co. : Elwha River Bridge, 1940, 2873. Chelan 

 Co. : Beaver Summit, 2800 ft., 1934, 2474. San Juan Co. : Brown Island, 



1940, 3195. 



This species is easily recognized by the circular masses of soredia scat- 

 tered over the upper surface of the thallus. 



3. Physcia hispida (Schreb.) Frege, Deutsch. Bot. Tasch. 169. 1812. 

 Lichen hispidus Schreb. Spicil. Fl. Lipsiens. 126. 1771. 



Thallus pale greenish gray, or ivory yellow (R), silvery gray or greenish 

 gray, foliose, often growing in small circular clusters, loosely adnate or 

 sub-erect, lobes stellately arranged, narrow palmately divided, distinct and 

 separate or imbricated, soredia borne on under surface of inflated, vaulted 

 tips, margins entire or crenate, often ciliate ; below white, mealy, bearing 

 numerous either light or dark rhizoids. Apothecia 0.5-2.0 mm. in diameter, 

 sessile to subsessile ; disk brown or black, usually pruinose, slightly concave 

 to flat; thalline margin entire to crenate; hypothecium hyaline; spores 

 brown, ovoid-ellipsoid, 1-septate, 15.0-22.0 x 6.0-10.0 fi. Cortex shows no 

 color change with KOH. 



On trees and rocks : Pacific Co. : Long Beach, 1940, 2758. San Juan 

 Co.: San Juan Island, Pt. Caution, 1931, 2101. Grays Harbor Co.: West- 

 port, 1908, Foster 665 (W). San Juan Co.: San Juan Island, Friday 

 Harbor, 1905, Frye 22 (F). Clallam Co.: Dungeness, 1914, Foster 2526 

 (W) ; Sequim, 1916, /. M. Grant 604 (F). Island Co.: Whidbey Island, 

 Langl'ey, 1924, /. M. Grant 213e (F). 



This species is rather common on trees close to the salt water. It is 

 easily distinguished by the numerous sorediate vaulted tips. 



4. Physcia leucoleiptes (Tuck.) Lettau in Hedw. 52:254. 1912. 



Physcia pulverulenta var. leucoleiptes Tuck. Proc. Am. Acad. Arts and 



Sci. 1:224. 1848. 

 Physcia pulverulenta (Schreb.) Nyl. 



Thallus white or pale drab-gray, foliose, pruinose, circular, appressed, 

 lobes long, branched, somewhat imbricated, margins entire or crenate, 

 interruptedly elevated, bearing white or yellow soredia ; below dark brown 

 or black. Apothecia rare, no fruiting material collected in the state has been 

 seen by the writer, the following description is from a Tuckerman specimen 

 collected, Cambridge, Mass., in 1837 (F), apothecia 2.0-4.0 mm. in di- 

 ameter, sessile to subsessile ; disk pruinose, concave to flat ; thalline margin 

 swollen, sorediate; hypothecium pale brown; spores brown, 1-septate, 

 23.0-35.0 X 18.0-27.0 ix. Cortex shows no color change with KOH. 



On trees or on thin layer of soil over rock : Douglas Co. : Lower Grand 

 Coulee, 1100 ft., 1931, 1524. Chelan Co.: Beaver Summit, 2800 ft., 1931, 

 1334a. 



