THE LICHEN-FLORA OF CHICAGO AND VICINITY. 25 



40. L, lacerum, (Sw.) Nyl. Thallus plumbeo-fuscescent, lacero- 

 laciniate, ample, wrinkled, the lobes dilated above and sinuate, 

 thin, crisped and dentate; apothecia small, pale-red, sub-ses- 

 sile, margin entire. Spores ovoid-ellipsoid. Ach. L. U. 657. 

 On elms in Hanover Township, near Elgin; also in Will County. 



41. L chloromelum, (Sw.) Nyl, Thallus small to large; orbiculate, 

 rigid; plumbeo-virescent, lobate, plicate, rugose; apothecia 

 medium size, lecanorine, plane, rufous, the thalline margin 

 granulate. Spores ovoid. Nyl. Syn. 1^8. Tuck. Gen. 98. 



On elms in Hanover Township, near Elgin; also in Will 

 County. The varieties are found further south. 



42. L, myochfoum, (Ehrh. Schaerer) Tuckerm. Thallus ample, cori- 

 aceous, membranaceous, sub-monophyllous, also loosely at- 

 tached, lead colored and blackish; beneath has a whitish nap; 

 apothecia reddish, border plicate. Spores ellipsoid. Tuck. 99. 



On the same substrate as the preceding species, Will County, 



43. L pulchellum, (Ach.) Nyl. Thallus small to large, rosulate, 

 glaucous green, lobes plicate, papulose, wrinkled above and 

 beneath and pitted; apothecia medium size, lecanorine, sub- 

 pedicellate, disk fusco-rufous, finally excluding the smooth or 

 finally rugose thalline margin. Spores ovoid-ellipsoid, sub- 

 muriform, decolorate. Collema, Ach. Syn. L. 321. Tuck. 

 Syn. 161. Calkins, exs. 



Found on calcareous rocks in Will County, and on elms in 

 Cook County. Better developed further south in this State. 



FAMILY 6. LECANOREI. 



Placodium, (D C.) Naeg. & Hepp. Thallus crustaceous, lobed, 

 suffruticulose, or uniform; apothecia sub-scutellaeform, leca 

 norine or sub-biatorine; disk usually yellow or orange. 

 Spores ellipsoid, polar-bilocular, colorless. 



44 P, cinnabarinum, (Ach.) Anzi. Thallus rimose-areolate, more 

 often of applanate scales, crenate, and crowded into an 

 imbricate crust, orange; apothecia minute or small, adnate; 

 disk orange, margin entire. Spores ellipsoid. Lecanora, Ach, 

 L. U. 402. Parmelia, Fr. L. E. 165. 



Very common on calcareous and arenaceous rocks in our 

 territory. 



