24 THE CHICAGO ACADEMY OF SCIENCES. 



34. C pycnocarpum, Nyl. Thallus small, pale, green, sub-orbi- 

 cular, lobes radiate, narrowed, fenestrate, ribbed, the marginal 

 lobules densely fruited; apothecia small; disk reddish, exclud- 

 ing margin. Spores ovoid ellipsoid, bilocular, decolorate. 

 Nyl. Syn., 115. 



Found on elms and shrubs in Will County; rare. 



35. C micfophyllum, Ach. Thallus small, fuscous-green, or 

 olivaceous, orbicular, diffract or effuse, microphylline; lobes 

 often granulate, crenate at centre; apothecia abundant, small, 

 urceolate, rufescent, flat; thalline margin entire, concolorous. 

 Spores sub-muriform. Ach. Syn. L. , 310. 



On elm bark; Cook and Will Counties; rare. 



36. C. flaccidum, Ach. Thallus dark-green, or olive-green; lobes 

 large, expanded, bullate, entire, with concolorous granules, un- 

 dulate plicate, paler beneath; apothecia small, sessile; disk 

 rufescent, margin entire. Spores ovoid. Ach. Syn. L., 322; 

 Tuck. Gen., 91. 



Occurs near Elgin and Joliet on oaks and elms; rare. May 

 be found on rocks also. 



37. C, tenax, (Sw.) Ach. Thallus thin, lobes wide, appressed, also 

 ascendant, lead-colored; apothecia often immersed; disk rufes- 

 cent, the margin entire or rogose. Var. c. of C. pulposum, 

 Tuck., exs. n., 148. Calkins, exs. 



Found near Joliet on calcareous soil; rare. 



38. C, limosum, Ach. Thallus thin, dark green, scattered, slightly 

 crenate, pulpy when wet; apothecia rufous, immersed but 

 becoming superficial, margin prominent, entire or somewhat 

 crenulate. Spores in fours in the thekes. Nyl. Syn., 110. 

 Inhabits clay soil. Will County; rare. 1 



30.. C, granosum, (Wulf.) Schaerer. Thallus small, rigid, gelatin- 

 ous when wet; lead-colored; lobes ample, rounded or elong- 

 gated and divided; apothecia of medium size, sessile; disk 

 reddish, dark. C. dermatinum, Ach. L. U., 64 . 

 On mossy rocks near Desplains River, Will County. 



Leptogium, (Fr.) Nyl. Thallus foliaceous, or fruticulose, cortical 

 layer distinct; gonimia in chains; apothecia sub-scutellasform, 

 lecanorine or sub-biatorine. Spores of various forms. 



I 



