GEOLOGY OF IvA SALLE COUNTY. 



137 



plane or tumid, pale to fusco-rufous or some- 

 times pruiiiose, marg-in white, commonly crenate 

 or entire, may be excluded. Th. Pr. Scand. 

 250. L. umbrina, Massalong'o, Nyl. On rails 

 and calcareous rocks. 

 Iv. varia, Ehrh. Nyl. Tliallus verruculose, green- 

 ish or yellowish, apothecia small, the disk yel- 

 low to flesh-color or rufescent, thin, marg-in 

 entire or crenulate, often excluded. Spores ob- 

 long-ellipsoid. Nyl. Scand. 163. On various 

 trees. 



L. varia, Ehrh., Nyl., var. symmicta, Ach. Thal- 

 lus thin, whitish, apothecia yellowish, disk 

 swollen, excluding- marg-in, biatoroid. Fr. L. 

 E. On various trees. 



L. calcarea, Sommerf., Thallus white, contig-uous 

 apothecia innate, emerg-ing-, disk g-rey-pruinose. 

 Spores ovoi'd-ellipsoid. NyL Scand, 154. On 

 calcareous rocks, La Salle. 



Iv. -calcarea, Sommerf. var. contorta, Fr. Areoles, 

 discrete, pale lead color. L. calcarea, f . Hoff- 

 mani, Nyl. On calcareous rocks at Bailey's 

 Falls, etc. A very curious form. 



L. cervina, Pers., Nyl. Thallus tartareous, areo- 

 late, squamulose, scales sub-peltate, from yel- 

 lowish to chestnut, apothecia medium size, im- 

 pressed, becoming- superficial, disk reddish 

 brown, thalline marg-in obsolete. On Trenton 

 rocks at Eton's mill and elsewhere. 



L. privig-na, Ach., Nyl. Thallus wanting-, apothe- 

 cia varying- from small to larg-e, sessile, ap- 

 pressed, scattered or ag-g-reg-ated, disk dark red, 

 marg-in elevated, rug-g-ed, contorted. Spores 

 numerous, minute. Lecidea, Ach. M. h. 49. 

 Sarcog-yne, Koerber, Syst., 266. On St. Peters 



