26 THE CHICAGO ACADEMY OF SCIENCES. 



45. P, microphyllum, Tuckerm. Thallus squamulose; from green- 

 ish-yellow to orange; scales adnate, crowded and concealed by 

 granules; apothecia small, adnate, flat, orange; proper 

 margin entire, the thalline one crenulate. Spores ellipsoid. 

 Tuck. Syn. 174. 

 Found near Lemont, on old fence panels, and in Will County. 



36. P, aurantiacum, (Light.) Naeg. & 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 

 margin thin, the thalline one crenulate or may be obsolete. 

 Parmelia, Fr. L. E. 165. Lecanora, Nyl. Scand. 142. Tuck. 

 Syn. 174. Calkins, exs. 



On elms and poplars at Glencoe; on hickories and other trees 

 along the Desplaines river; on rocks at Lemont, and else- 

 where. Thallus and apothecia lemon color, in our specimens; 

 abundant. 



47. P, ferrugineum, (Hudson) Hepp. Thallus chinky, verruculose, 

 ash colored, upon a black hypothallus; apothecia fair size, 

 mostly biatorine, sessile, flattish; disk opaque, rust-colored, or 

 fulvous, bordered by a crisp proper margin, -often enclosed in 

 a thalline one. Parmelia, Fr L. E. 170. Caloplaca, Th. Fr. 

 Scand. 182. Tuck. Syn. 177. 



On oaks along the Desplaines river and near Elgin on 

 hickories. Not so common as the preceding species, but 

 plentiful. 



48. P, vitellinum, Ehrh. Thallus effuse, tartareous, squamaceous, 

 of crenale granules, crowded into heap-like areoles, often 

 dispersed, greenish-yellow; apothecia small, sessile, flat, yel- 

 low; thalline margin granulate-crenate. Spores numerous, 

 simple and bilocular. Fr. L. E. 162. Nyl. Scand. 141. 

 Tuck. Syn. 180. 



Found on dead wood and rails in Lemont Township. Not 

 common for lack of proper conditions. 



Lecanorat (Ach. ) Tuckerm. Thallus crustaceous; mostly uniform; 

 apothecia scutellaeform, or zeorine. Spores ellipsoid, or 

 oblong. 



