GEOIvOGY OF IvA SALLE COUNTY. 



135 



thecia sub-scutell^form, lecanorine or sub-bia- 

 torine, disk usualh^ yellow or orang-e. Spores 

 ellipsoid, polar-bilocular, colorless. 



P. cinnabarinum, Ach.. Anzi. Thallus rimose- 

 areolate, more often of applanate scales, cre- 

 nate, and crowded into an imbricate crust, 

 orang-e, apothecia minute or small, adnate, disk 

 orang-e, marg-in entire. Spores ellipsoid. Le- 

 canora, Ach., L. U. 402. Parmelia, Fr. L. E. 

 165. Very common on calcareous and arenace- 

 ous rocks. Lowell mill dam raec. 



P. microphyllum, Tuckerm. Thallus squamulose, 

 from g-reenish yellow to orang-e, scales adnate, 

 crowded and concealed by g-ranules, apothecia 

 small, adnate, flat, orang-e, proper marg-in entire, 

 the thalline one crenulate. Spores ellipsoid. 

 Tuck. Syn. 174. On old fence panels and 

 rails on Deer Park road, also elsewhere. 



P. aurantiacum, Lig-ht., Nsg-. & Hepp. Thallus 

 uneven and chinky, warted, broken; yellow or 

 variously colored, often bordered by a dark 

 hypothallus, apothecia fair size, sessile, zeorine, 

 flat, disk lemon, saffron or tawny colored, proper 

 marg-in thin, the thalline one crenulate, or may 

 be obsolete, Parmelia, Fr.L.E. 165. Lecanora, 

 Nyl. Scand. 142. On various trees. Common. 



P. ferrug-ineum, Huds., Hepp. Thallus chinky, 

 verruculose, ash-colored, upon a black hypothal- 

 lus, apothecia fair size, mostly biatorine, sessile, 

 flattish, disk opaque, rust colored, or fulvous, 

 bordered by a crisp proper marg-in, often en- 

 closed in a thalline one. Parmelia, Fr. Iv. E. 

 170. Caloplaca, Th. Fr. Scand. 182. On oaks, 

 Deer Park. 



P. vitellinum, Ehrh. Thallus effuse, tartareous, 



