LICHENS OF THE STATE OF WASHINGTON 13 



D. Thallus lobes rarely imbricated 3. D. miniatiim 



A. Thallus squamulose, not umbilicate. 



E. Sqtiamules divided into many small lobes, often with acute ascending 



tips; below smooth 6. D. polyphyllum 



E. Squamules entire; below bearing rhizoids 2. D. hepaticum 



1. Dermatocarpon aquaticum (Weis.) Zahlbr. Ann. Nat. Hofmus. Wien. 

 16:81. 1901. Lichen aqiiaticiis Weis. PI. Crypt-Fl. Goett. 77. 1770. 

 Endocarpon flitviatile (Web.) DC. Dermatocarpon fluviatile (Web.) 

 Th. Fr. 



Thallus grayish-brown, brown, or Isabella color (R), foliose, small to 

 medium, thick, coriaceous, smooth or very minutely granular-pruinose, 

 many lobed, crowded, margins entire or somewhat sinuate; below brown 

 or black, attached to the substratum by an umbilicus. Perithecia appearing 

 on the surface as very small dark spots; asci 8-spored; spores hyaline, 

 ellipsoid, nonseptate, 10.5-16.0 x 6.0-9.5 /x. 



On rocks usually submerged in water : San Juan Co. : Brown Island, 

 1940, 3257. Jefferson Co. : Oueets River Valley, in streamlet, 5000 ft., 1907, 

 Frye 13, (F). Determined as Endocarpon fluviatile DC. 



2. Dermatocarpon hepaticum (Ach.) Th. Fr. Nov. Act. Reg. Soc. Sci. 

 Upsal. Ill, 3:355. 1861. Endocarpon hepaticum Ach. in Kgl. Vetensk- 

 Akad. Nya. Handl. 156. 1809. 



Thallus reddish brown, or dusky brown (R), squamulose; squamules 

 small or medium sized, circular or irregular in shape, flat, margin often 

 blackish, entire or crenate, somewhat imbricated; below almost black; 

 closely attached to the substratum by fine rhizoids. Perithecia numerous, 

 appearing on the surface as tiny dark spots ; asci 8-spored ; spores hyaline, 

 ovoid, nonseptate. 9.0-14.0 x 5.0-8.0 /x. 



On soil: Cascade Mountains, 1883, Brandegee 17 (T). 



3. Dermatocarpon miniatum (L) Mann, Lich. Bohem. observ. Dispos. 66. 

 1825. Lichen miniatus Linn. Sp. PI. 1149. 1753. Endocarpon miniatum 

 (L.) Gart. 



Thallus grayish olive (R), deep grayish olive (R), or various shades of 

 brown, foliose, rather large and spreading, coriaceous, lobes rounded plicate, 

 surface smooth or minutely granular-pruinose; below usually darker fus- 

 cous-black (R), blackish brown or light brownish-olive (R), smooth to 

 minutely granular-pruinose, sometimes slightly veined ; loosely attached to 

 the substratum by an umbilicus. Perithecia minute, numerous; asci 8- 

 spored; spores hyaline, ovoid to ellipsoid, nonseptate, 6.6-16.5 x 3.9-6.6 fx,. 



On rock: Yakima Co.: Deadhorse Hill, 4000 ft., 1931, 989. Klickitat 

 Co.: Goldendale, 2000 ft., 1931, 1695. Okanogan Co.: butte near Twisp, 

 1931, 1460. Ferry Co.: between Curlew and Danville, 1773 ft., 1931, 1414. 

 Whitman Co.: Pullman, 2550 ft., 1931, 1578. San Juan Co.: Waldron 



