312 



38. LECANORACEAE [145. Lecania 



4. Lecania erysibe (Ach.) Mudd, Man. Brit. Lich. 141. pro parte pi. 2, f. 47. 



Lichen erysibe Ach., Lich. Suec. 50. 1798. Lecanora erysibe (Ach.) Nyl. 



Thallus thin, composed of rarely scattered, irregular, olive to greenish gray 

 granules, or becoming scurfy or subareolate; apothecia minute to small, 0.5-1 mm. 

 across, adnate, the disk flat to more or less convex, brown to blackish brown, the 

 exciple colored like the thallus, becoming crenulate and sometimes disappearing; 

 spores ellipsoid, becoming 1-septate, 10-14 X 4-6 /a. 



On rocks, Illinois, Iowa, and Minnesota. 



5. Lecania albariella (Nyl.) Mull. Arg., Rev. Mycol. 2:76. 1880. 

 Lecanora albariella Nyl, Act. Soc. Linn. Bord. 21:63. 1856. 



Thallus thin, smooth to chinky-areolate, dirty creamy-white, becoming scat- 

 tered and disappearing; apothecia minute, 0.1-0.25 mm. across, adnate, the disk 

 flat to convex, brown to brownish black, or whitish pruinose, the exciple thin, 

 colored like the thallus, soon disappearing; spores ovoid-ellipsoid, 1-septate, 10-15 

 X 4.5-6.5 p. 



On calcareous rocks, Ohio. Material doubtfully included. 



6. Lecania californica (Zahlbr.) Fink n. comb. 



L.turicensis var. californica Zahlbr., Beih. Bot. Centralb. 13:159. 1902. 



Thallus very thin, composed of minute, scattered, ashy white, soon disappear- 

 ing granules; apothecia minute to small, 0.15-0.4 mm. across, adnate, the disk flat 

 to strongly convex, white-pruinose or flesh-brown to darker, the exciple very thin, 

 scarcely conspicuous and becoming flexuous, soon disappearing; spores ellipsoid 

 1-septate, 9-13 X 3-4.5 /j, 



On calcareous rocks, southern California. 



7. Lecania Dudleyi Herre, Proc. Wash. Acad. Sci. 12:188. 1910. 



Thallus rather thick, composed of small, tough, semiglobular, somewhat clus- 

 tered, light to reddish brown warts; apothecia small to middle-sized, 0.6-1.2 mm. 

 across, immersed to partly immersed, the disk flat to slightly convex, dark brown, 

 the exciple becoming thin and disappearing, colored like the thallus, soon flexuous ; 

 spores oblong-ellipsoid, 1-septate, 12-16X6-7.5^. 



On soil and rocks, California. 



8. Lecania Nylanderiana Mass., Sched. Crit. Lich. Exsicc. 152. 1855. 

 Thallus thin, granulose, becoming chinky-areolate, dirty grayish to ashy white; 



apothecia minute to small, 0.2-0.6 mm. across, adnate, the disk flat to convex, 

 brown to brownish black or grayish pruinose, the exciple thin, colored like the 

 thallus, often disappearing; spores 1-3-septate, oblong-ellipsoid, 12-18 X 4-5.5 \x. 

 On rocks, Iowa. 



9. Lecania Brunonis (Tuck.) Herre, Proc. Wash. Acad. Sci. 12:188,189. 1910. 

 Lecanora Brunonis Tuck., Gen. Lich. 116. 1872. 



Thallus thin, composed of minute, usually confluent, imbricated, pale to darker 

 brown squamaceous granules, bearing round elevations; apothecia small to middle- 

 sized, 0.4-1 mm. across, adnate to sessile, the disk concave to flat or slightly 

 convex, rusty brown to dull black, the exciple thin, colored like the thallas or 

 blackening, becoming crenulate and finally disappearing; spores oblong-ellipsoid, 

 1-septate, 10-17 X 4.5-7 /x. 



On rocks, Nebraska and California. 



10. Lecania subdispersa (Nyl.) Hasse, Cont. U.S. Nat. Herb. 17:97. 1913. 

 Lecanora subdispersa Nyl., in Hasse, Lich. South. Calif. 12. 1898. 



Thallus thin, composed of minute, greenish gray to brownish, somewhat imbri- 

 cated squamules or squamiform granules; apothecia small to middle-sized, 0.4-1 

 mm. across, sessile, the disk flat, reddish brown to brownish black, the exciple thin, 

 colored like the thallus, rarely disappearing; spores ellipsoid, 1-septate, 15-21 X 

 3-4.5 fi. 



On rocks, California. 



