LICHENS OF THE STATE OF WASHINGTON 109 



circular, scattered, immersed, adnate or sessile, or rarely stipitate, proper 

 margin usually absent, thalline margin well developed, asci 4-32-spored; 

 spores hyaline, rarely brownish, nonseptate, 2-many-septate, or muriform, 

 thin walled. 



Alga Protococcus or Protococcus and Gloeocapsa. 

 A. Spores nonseptate. 



B. Spores large always more than 30 {x long; paraphyses branched, co- 

 herent. 47. Ochrolechia 



B. Spores smaller ; paraphyses unbranched, distinct or coherent. 



C. Thallus usually egg-yellow or orange ; disk always some shade of 



yellow. No color change with KOH 51. Candelariella 



C. Thallus very seldom egg-yellow or orange ; disk not often yellow ; 

 thallus, if yellow, turns bright yellow, red, or purple with KOH. 



46. Lecanora 

 A. Spores septate. 



D. Spores 1-3-septate. 

 E. Spores usually 1 -septate. 



F. Thallus usually egg-yellow or orange ; disk always some shade of 



yellow. No color change with KOH 51. Candelariella 



F. Thallus never egg-yellow or orange, sometimes pale yellow ; disk 



never yellow ; no color change with KOH 49. Lecania 



E. Spores usually more than 1 -septate, paraphyses unbranched, dis- 

 tinct 48. Icmadophila 



D. Spores 3-many-septate, disk purplish blue with KOH. 



50. Haematomma 



46. Lecanora Ach. Lichenogr. Univers. 77. 1810. 



Thallus crustose, marginally lobed, squamulose, rarely subfoliose or 

 very rarely fruticose; crustose species have no differentiation into layers, 

 or only poorly developed upper cortex, algal layer, and medulla; foliose 

 forms have a well-developed, gelatinized, pseudocellular upper cortex, an 

 algal layer and a medulla, but a poorly developed lower cortex, attached to 

 the substratum by hyphal rhizoids or an umbilicus. Apothecia circular, 

 immersed, adnate or sessile, with a poorly developed proper margin, but 

 a distinct thalline margin ; hypothecium hyaline or colored ; paraphyses dis- 

 tinct or coherent and unbranched ; asci normally 8-spored, rarely 4-16-32- 

 spored ; hyaline ; nonseptate, thin walled without a halo. A large and diffi- 

 cult genus. 



Alga Protococcus or Protococcus and Gloeocapsa. 



A. Always on rock (Placodium). • 



B. Bearing cephalodia and soredia 25. L. gelida 



B. Bearing neither cephalodia nor soredia. 

 C. Thallus squamulose, not marginally lobed. 



D. Attached to the substratum by an umbilicus, thallus small, con- 

 sisting of closely united squamules 22. L. peltata 



D. Not attached to the substratum by a single, definite umbilicus. 



