LICHENS OF THE STATE OF WASHINGTON 173 



Thallus dark olive-brown (R) or greenish-brown, squamulose, com- 

 posed of flat or rounded crenately lobed squamules or the thallus may 

 become areolate. Apothecia 0.2-1.0 mm. in diameter, adnate; disk black, 

 flat to convex; proper margin thin, raised, black, becoming irregular and 

 finally disappearing; hypothecium brown; paraphyses distinct, slender, 

 with brown globose tips; asci 8-spored; spores brown, ellipsoid, 1 -septate, 

 10.0-15.0 X 6.0-7.0 /x. 



On moss growing over rock: Washington Territory, Suksdorf, 112, 

 274 (F). Fink (1935) reports this species from Washington. 



One must have material bearing mature spores to make correct deter- 

 minations of Buellia species. 



68. Rinodina Ach. S. F. Gray, Nat. Arr. Brit. PI. 1 :448. 1821. 



Thallus crustose, seldom squamulose, uniform all over or sometimes 

 marginally lobed, cortex is usually poorly developed, except in the squamu- 

 lose forms, where it becomes plectenchymatous, a thin algal layer and a 

 more or less well developed medullary layer of loosely interwoven hyphae 

 are always present. Apothecia circular, immersed to adnate or sessile, 

 proper margin very thin, often lacking; with thalline margin usually 

 present, concolorous with the thallus, rarely disappearing; hypothecium 

 hyaline to brownish ; paraphyses rarely branched, thread-like, often thick- 

 ened at the tips ; asci usually 8-spored, rarely as many as 24-spored ; smoky 

 gray, brown, or black, 1 to rarely 3-septate, with strong thickened walls, 

 polar-bilocular cell contents usually united by an isthmus. 



A. On bark. 



B. Hypothallus conspicuous, apothecia reddish brown. 3. R. Hallii 



B. Hypothallus not conspicuous, apothecia brown or black. 



5. R. sophodes 



A. Not on bark. 



C. On soil. 



D. Spores 1-septate 4. R. orhata 



D. Spores becoming 3-septate. 2. R. Conradi 



C. Not on soil. 



E. Thallus lobed at periphery, on rock 6. R. oreina 



E. Thallus not lobed at periphery, on rock, rarely on wood. 



1, R. confragosa 



1. Rinodina confragosa (Ach.) Korb. Syst. Lich. German 125. 1855. 

 Parmelia conjragosa Ach. Meth. Lich. Suppl. 33. 1803. 

 Rinodina sophodes var. confragosa (Ach.) Tuck. 



Thallus white or grayish-white, crustose, thin or rather thick, coarsely 

 granulose or becoming warty, granules scattered upon an inconspicuous 

 black hypothallus, which is sometimes not visible at all. Apothecia 0.5-1.3 

 mm. in diameter, adnate to sessile; disk brownish-black to black, flat; 



