THE LICHEN-FLORA OF CHICAGO AND VICINITY. 31 



72. C. urceolatum, (Ach.) Tuckerm. Thallus smooth, becoming 

 chinky and rugged, whitish; apothecia small, urceolate^ from 

 black to pruinose; prominent, elevated. Lecidea, Ach. L. U. 

 671. Gyrostomum, Fr. Tuck, Gen. L. 129. Conotrema, 

 Tuck. Syn. 217. 



This, the only species of the genus and has a wide distribution. 

 Found on maples and poplars in Cook and Will Counties; 

 also further west and south in Illinois. The genus Gyalecta 

 should occur with this in our territory, affording at least the 

 two species, G, lutea and G. trivialis, Willey. They are 

 very small and may have escaped discovery here, though 

 found in southern Illinois. 



Urceolaria, (Ach.) Flotow. Thallus crustaceous, uniform; apothe- 

 cia urceolate. Spores ovoid-ellipsoid, muriform, pluri-locular; 

 fuscescent. 



73. U, scruposa, (L.) Nyl. Thallus tartareous, rugose-plicate; 

 glaucous, ash-colored or white; apothecia immersed, but 

 emerging, urceolate, large, black; disk somewhat cinereous; 

 margin denticulate, hidden by the thalline one, if present. 

 Nyl. Scand. 176. Tuck. Syn. 222. Muhl. Cat. 1818. 

 Found on calcareous earth in Will County and on dead cedars 



along the banks of the Illinois; rare. 



TRIBE II. LECIDEACEI. 



FAMILY 7. CLADONIEI. 



Cladonia, Hoffman. Thallus squamulose, rarely granulose or 

 deficient; apothecia variously colored, but never black; soon 

 inflated and cephaloid; podetia fistulous, funnel or tubulose in 

 shape, often shrub-like. Spores small. Tulasne, Mem. sur. 

 les Lich. Tuck. Gen. Lich. and Syn. 



74. C. mitrula, Tuckerm. Thallus of small squamules, minute, 

 green; podetia short, granulate, glaucescent; apothecia con- 

 fluent, flesh-colored or brown. Tuck, in Fl. Cestrica. 444. 

 Nyl. Syn. 203. 



On earth and old logs in Cook and Will Counties. Generally 

 distributed west and south. 



