96 LICHENS OF THE STATE OF WASHINGTON 



(F). Thurston Co. : Gate, 1912, Foster 1947 (W). Spokane Co. : Spokane, 

 1930, Sister Marion Loretta (WTU). 



The densely tomentose podetia, with cephalodia containing Nostoc, dis- 

 tinguish this species from St. paschale, which it resembles rather closely. 



6. Stereocaulon tomentosum var. simplex Riddle, Bot. Gaz. 50 : 298, 1910. 



Podetia elongated exceeding 8 cm., slender, seldom branching, squam- 

 ules few and scattered, otherwise like the species. 



On soil: Mt, Rainier, Longmire Springs, 1904, T. C. Frye (F). Olym- 

 pic Mountains, 1907, T. C. Frye (F). 



19. UMBILICARIACEAE 



Thallus foliose, 1 -several-leaved, dorsi-ventral, with both upper and 

 lower plectenchymacous cortices, also well-developed spongy algal and 

 medullary layers, firmly attached to the substratum by a single umbilicus 

 or by several cords. Apothecia circular to somewhat angular, scattered over 

 the upper surface, immersed, adnate, sessile, or with a short stipe, the 

 proper margin usually black, thalline margin seldom present; disk rarely 

 smooth, usually gy rose-plicate ; asci 1-8-spored; spores hyaline or brown- 

 ish, nonseptate, 1 -septate, or muriform. 



Alga Protococcus. 



42. Umbilicaria (Hofifm.) Nyl. em. Frey, Kaben-Krypt. Fl. 94 :205. 1933. 



Gyrophora Ach. Meth. Lich. 100. 1803. 



Thallus foliose, upper surface smooth or areolate cracked, often with 

 squamules or with leaf-like appendages, with raised ridges ; below smooth, 

 papillate, warty, lacerate, with or without rhizoids, more or less fibrillose or 

 hirsute, firmly attached to the substratum by a single umbilicus or by 

 several cords. Apothecia scattered on the upper surface, circular or angular, 

 immersed, adnate, or sessile, usually with a short stipe; proper margin 

 prominent, thalline margin absent, hypothecium brownish or black; para- 

 physes more or less distinct; asci 1-8-spored; spores hyaline or finally 

 brown, nonseptate or muriform. 



A. Thallus with fibrils below. 

 B. Fibrils not always abundant. 



C. Upper surface reticulated with black indented lines ; below radiately 

 ridged 4. U. erosa 



C. Upper surface not always reticulated, sometimes papillose ; below 



not radiately ridged 10. U. virginis 



B. Fibrils always abundant. 

 ■ D. Thallus large, upper surface gray, grayish brown, or black. 



9. U. vellea 



D. Thallus small to medium sized, dark brown, purplish brown or 



black. 

 E. Apothecia large, dome-shaped 8. U. polyrrhiza 



