144 GEOLOGY OF LA SALLE COUNTY. 



B. nH«*iiiosa, Schrad., Fr. Apothecia small to 

 minute, rufous-brown to black, a^g*re^ated, 

 thallus effuse. On dead wood and earth. Deer 

 Park. 



LECIDEA, Ach., Fr. Tuckerm. Thallus various, 

 crustaceous, squamulose or evanescent, apothecia 

 patellaeform, horny. Spores colorless. Fr. L.E. 

 Iv. enteroleuca, Fr. Thallus g-ranulose and cine- 

 rascent, often wantino", apothecia small to larg-e, 

 adnate, convex, often excluding* marg-in, black. 

 Spores ovoid-ellipsoid. This species has many 

 forms and has been described under various 

 names. Some of them occur on rocks and 

 mosses, others on trees. It is found on maples. 



' L. cyrtidia. Tuck. Apothecia minute. On recent 

 sandstones, Deer Park. 



BUELLIA, De Not., Tuckerm. Thallus mostly uni- 

 form, apothecia patellsef »rm. Spores ellipsoid, 

 brown or decolorate. 

 B. parasema, Ach., Th. Fr. Thallus cinerascent 

 or darker, rug^ose, g^ranulate, g^laucescent, apo- 

 thecia sessile, black, disk flat, often turbid, 

 marg-in thin. Lecidea, Fr. Tuck. Syn. N. E- 

 67. On oaks and dead wood. Occurs every- 

 where in North America; a variable species. 

 B. schaereri, De Not. Thallus granulose, often 

 wanting, cinerascent, apothecia very small, 

 black, flat, disk turg-escent and margin wanting". 

 Lecidea nigritula, Nyl. Scand. 238. Found on 

 an old stump, also on old rails; not common. Is 

 also found in Grundy County. 



TRIBE III. GRAPHIDACEI— OPEGRAPHEI. 



OPEGRAPHA, Humb., Ach. Nyl. Thallus hypo- 

 phlsous, or, if exposed, thin, apothecia nor- 

 mally lirellaiform. 



