LICHENS OF THE STATE OF WASHINGTON 155 



A. Thallus sorediate or soraliate. 



B. White powdery soredia, on tips only. 



C. Thallus delicately branched, tips not bursting open 8. R. Roesleri 



C. Thallus rather coarsely branched, tips bursting open. 



6. R. pollinaria 



B. Thallus soraliate, usually on the margins, never broadly expanded, 



sometimes channeled but not lacunose 4. R. jarinacea 



A. Thallus neither abundantly sorediate or soraliate. 



D. Thallus a lace-like network, long and pendulous 7. R. reticulata 



D. Thallus not a lace-like network, not long and pendulous. 

 E. Medulla floccose, bursting through cracks in the cortex. 



1. R. ceruchis 



E. Medulla not as above. 

 F. Thallus fistulate. 



G. Thallus forming small cushion-like masses, slightly inflated. 



3. 7?. dilacerata 

 G. Thallus larger, more spreading, apothecia abundant, attached 



just below the deflexed tips of the branches 2. R. digitata 



F. Thallus not fistulate, membranaceous, becoming lacunose, apo- 

 thecia marginal or subterminal, rather abundant. 



5. R. Mensiesii 



1. Ramalina ceruchis (Ach.) De Not. Giorn. Bot. Ital. 2:218. 1846. 

 Parmelia ceruchis Ach. Meth. Lich. 260. 1803. 



Thallus honey colored (R), straw yellow (R), or sometimes rufescent, 

 black towards the base, lobes tufted, erect, subterete or flattened, smooth or 

 deeply pitted and wrinkled, punctate with large black spermagonia, simple 

 or sparingly branched, tips attenuated. Apothecia not uncommon, marginal, 

 1-6 mm. in diameter, sessile; disk buff or concolorous with the thallus, 

 often pruinose, concave to convex ; thalline margin crenulate ; spores hya- 

 line, oblong-ellipsoid, straight or slightly curved, nonseptate, 12.0-16.0 x 

 3.0-5.0 IX. 



On trees, old wood, and rocks : San Juan Co. : San Juan Island, Kanaka 

 Bay, Foster, reported by Merrill (1911). Clallam Co.: Dungeness, 1913, 

 Foster 2533 (F). 



It always grows near the ocean. Older plants and those in herbaria are 

 very often partly covered with a white or grayish white cottony floccose 

 down, resembling mold; this is caused by the medullary hyphae bursting 

 through the cracks in the cortex. 



2. Ramalina digitata Mey. et Flw. Nova Acta Acad. Leopoldin.-Carolin. 



19, Suppl. 212. 1843. 

 Ramalina geniculata Hook. f. et Tayl., London Jour. Bot. 3. 655. 1844. 

 Ramalina pusilla var. geniculata Tuck. Syn. N. Am. Lich. 26. 1882. 

 Ramalina inflata Hook. f. and Tayl. 



