143. Ochrolechia ] 38. LECANORACEAE 309 



ish, especially toward the tips; paler below than above to reddish brown, the 

 lobes sometimes longitudinally furrowed; apothecia unknown. 



On soil, Nebraska, South Dakota, and Wyoming. Usually unattached, blown 

 about, and sometimes drifting when dry. Fruiting condition needed to decide 

 finally the relationships of the plant. 



66. Lecanora Bolanderi Tuck., Proc. Am. Acad. 6:266. 1866. 



Thallus loosely tufted and dichotomously much-branched, the branches erect 

 or ascending, cylindrical, with obtuse papilliform tips, greenish straw-colored; 

 apothecia middle-sized to large, 0.5-4 mm. across, terminal or subterminal, the disk 

 concave to flat, flesh-colored to yellowish and brownish, the exciple swollen and 

 becoming crenulate, colored like the thallus; spores ovoid-ellipsoid, 10-16X5- 

 7.5 fi. 



On rocks, California. 



67. Lecanora thamnitis Tuck., Lich. Calif. 20. 1866. 



Thallus made up of short, erect or ascending, more or less divided, crowded, 

 pale straw-colored branchlets, often forming a crust; apothecia middle-sized to 

 large, 0.6-1.5 mm. across, subterminal, the disk concave to flat, pale yellowish to 

 tawny red, the exciple thick, colored like the thallus, crenate; spores ovoid-ellip- 

 soid, 10-14 X 6-8/*. 



On rocks, along the coast, California. 



68. Lecanora phryganitis Tuck., Lich. Calif. 19. 1866. 



Thallus reddish yellow or fading to lighter shades, appearing very rough and 

 often tuberculate, but really composed of many closely clustered branches, those 

 toward the center short and erect, the marginal ones longer and ascending to 

 prostrate; apothecia middle-sized to large, 1.5-4 mm. across, subsessile, the disk 

 concave to flat, pale brick-colored to brownish, the exciple thin, colored like the 

 thallus, becoming flexuously lobed; spores oblong-ellipsoid, 10-15 X 5-6.5 /x. 



On rocks, California. 



OTHER SPECIES REPORTED 



Lecanora castanea (Hepp) T. Fries — Colorado. 



Lecanora cinerea var. obscurata E. Fries — Maryland. 



Lecanora conizaea (Ach.) Nyl. — Tennessee. 



Lecanora constipans Nyl. — California. 



Lecanora erythrantha Tuck. — California. 



Lecanora fulva Schw. — New York. 



Lecanora galactina (Ach.) Nyl. — Maine. 



Lecanora glaucophana Nyl. — California. 



Lecanora holophaea (Mont.) Nyl. — California. 



Lecanora myrina Fee — South Carolina. 



Lecanora olivacea (Bagl. & Car.) Steiner — Nevada. 



Lecanora spodophaeiza Nyl. — California. 



143. Ochrolechia Mass., Ric. Lich. 30. 1852. 



Thallus crustose, smooth to more or less rough, chinky, areolate, warty or 

 rarely minutely branched, often sorediate, the upper cortex thin or sometimes 

 wanting, composed of vertically or irregularly septate, coherent, thin-walled 

 hyphae, the algal layer distinct, the medullary layer of loosely interwoven, thin- 

 walled hyphae, attached to the substratum by hyphal rhizoids; apothecia middle- 

 sized to large, immersed to adnate or sessile, the disk concave to flat or convex, 

 the exciple colored like the thallus, more or less irregular; hypothecium hyaline; 

 hymenium hyaline; paraphyses branched and interwoven; asci clavate, with apical 

 wall slightly thickened; spores 2-8, hyaline, ellipsoid to ovoid- or oblong-ellipsoid, 

 non-septate. 



The algal host is Pleurococcus. 



