145. Lecania] 38. LECANORACEAE 311 



line or brownish above; paraphyses unb ranched; asci clavate; spores 8, rarely 16- 

 32, hyaline, 1 -septate. 



The algal host is Pleurococcus. 



A. On trees 



B. Spores constantly 1-septate 1. L. syringea dimera 



B. Spores 1-3-septate 



C. Thallus chinky to sometimes warty, ashy brown to whitish . 1. L. syringea 

 C. Thallus chinky to granulose or warty, greenish gray to darker . 2. L. cyrtella 

 A. On rocks and soil 



B. Thallus dark gray to brownish or reddish brown to darker 

 C. Thallus of squamules or squamiform granules 



D. Granules imbricated 10. L. subdispersa 



D. Granules bearing round elevations 9. L. Brunonis 



C. Thallus of scattered or clustered warts 



D. Warts light to reddish brown 7. L. Dudleyi 



D. Warts dark gray to blackish 11. L. fructigena 



B. Thallus greenish gray to ashy or white 



C. Thallus of clustered squamules 12. L. toninioides 



C. Thallus of minute granules or areoles 



D. Apothecia more or less whitish pruinose 



E. Spores 1-3-septate 8. L. Nylanderiana 



E. Spores 1-septate 



F. Thallus smooth to chinky-areolate 5. L. albariella 



F. Thallus of minute granules 6. L. californica 



D. Apothecia not pruinose 



E. Apothecia 0.2-0.6 mm. across 3. L. perproxima 



E. Apothecia 0.4-1 mm. across 4. L. erysibe 



1. Lecania syringea (Ach.) T. Fries, Lich. Scand. 1:290,291. 1871. 



Parmelia Hagenii var. syringea Ach., Meth. Lich. 163. 1803. L. fuscella (Schaer.) 

 Koerb. Lecanora athroocarpa Duby. Lecanora metabolica Ach. Lecanora 

 athroocarpa var. Macounii Tuck. 



Thallus thin to very thin, smooth to chinky and sometimes warty, frequently 

 disappearing, ashy brown to whitish; apothecia minute to small, 0.25-0.6 mm. 

 across, subsessile, the disk flat to convex, pale brown to darker and finally black, 

 the exciple thin, colored like the thallus, sometimes disappearing; spores 8-16, 

 ellipsoid, 1-3-septate, 12-20 X 4.5-7 fi. 



On trees, Massachusetts, New Hampshire, Ohio, Illinois, Nebraska, and Cali- 

 fornia. 



var. dimera (Nyl.) Oliv., El. Lich. Orne 2:164. 1884. 

 Lecanora dimera Nyl, Not. Sallsk. Faun. Flor. Fenn. 5:169. 1861. L. dimera 



(Nyl.) T. Fries. 

 Spores said to be constantly 1-septate, a doubtful distinction. 

 On trees, California and Washington. 



2. Lecania cyrtella (Ach.) T. Fries, Lich. Scand. 1:294-96. 1871. 

 Lecidea cyrtella Ach., Meth. Lich. 67. 1803. 



Thallus very thin, smooth to chinky, becoming granulose or warty, greenish 

 gray to darker, sometimes disappearing; apothecia minute to small, 0.2-0.7 mm. 

 across, adnate to subsessile, the disk flat to convex, brick-red to brown and lurid 

 blackish, the exciple thin, colored like the thallus, disappearing; spores 8-16, 

 oblong to fusiform-oblong, 1-3-septate, 9-16 X 3.5-5 /a. 



On trees, Vermont, New York, Colorado, California, and Washington. 



3. Lecania perproxima (Nyl.) Zahlbr., Cat. Lich. Univ. 5:739. 1928. 

 Lecanora perproxima Nyl.; Calkins, Bull. Chicago Acad. Sci. 1:29. 1896. 

 Thallus thin, minutely granulose, becoming chinky, ashy white to grayish; 



apothecia minute to small, 0.2-0.6 mm. across, adnate, the disk concave to slightly 

 convex, black, the exciple thin, colored like the thallus, becoming flexuous; spores 

 ellipsoid, becoming 1-septate, 14-18 X 5-7 p. 

 On rocks, Illinois. 



