18 THE CHICAGO ACADEMY OF SCIENCES. 



FAMILY 2. PARMELIEI. • 



Theloschistes, Norm. (Physcia, Nyl.) Thallus foliaceous or re- 

 duced, appressed or ascendant; membranaceous, orange or 

 yellowish, apothecia scutellaeform; disk yellow, orange or 

 greenish-yellow. Spores ellipsoid, polar-bilocular or simple. 



6. T, cttrysophthalmus, (L-) Norm. Thallus tufted, more or less 

 erect, spreading; the branches narrow, linear, smooth or 

 puberulent; tips mostly fibrillose and ramulose; apothecia 

 few; disk orange, which is often fibrillose. Spores ellipsoid. 

 Parmelia chrysophthalma. Ach. M. L. 267. 

 In Hanover Township, Cook County, and Will County; at 



Lemont, on old rails in woods. Also on old oak trees near 



the lake shore. Lake View. 



v. T, parietinus, (L-) Norm. Thallus, foliaceous, sub-orbicular, 

 crenate, yellow and orange, lobes appressed, sub-imbricate, 

 radiant, rounded; apothecia small to ample, orange, border 

 entire or flexuous. Spores ellipsoid. Parmelia, Fr. , L. E. 72; 

 Xanthoria, Th. Fr. L. Scand. , 145. 



Along the lake shore, on oaks and poplars; also in Lemont 

 and elsewhere. 



8. T, lychneus, (Nyl.) Thallus reduced, substellate, or effuse, yel- 



low; apothecia scattered; yellow-orange, entire or granulate. 



Spores ellipsoid. 



On walnut and hickories, west part of Cook County and else- 

 where. It has a numerous synonomy, and is often con- 

 sidered a variety of No. 7. 



9. T< concolar, (Dickson) Tuckerm. Thallus foliaceous, orbicu- 



lar, greenish-yellow; divisions narrow, much dissected; beneath 

 pale, fibrillose; apothecia small, yellow or rufous. Spores 

 numerous. Physcia candelaria, Nyl., etc. 

 On various trees along the lake shore at Glencoe. All the 



genus may be distinguished by the golden or yellow thallus. 



May be mistaken for Placodium. 



Parmelia, (Ach.) De Not. Thallus imbricate-— foliaceous, lobate or 

 laciniate, appressed, membranaceous; more or less fibrillose, 

 sometimes densely so; apothecia scutellaeform, slightly pedi- 

 cellate. Spores ellipsoid, J7dr Schwendener. 



