GEOLOGY OF LA SAIvLE COUNTY. 129 



medium to large, badio-rufescent, marg-in nearW 

 entire. Spores subellipsoi i. Ach. S. L. 218. 

 Occurs on oaks on the Vermillion. 



P. caperata, L., Ach. Thallus substramineous, 

 dilated, coriaceous, undulate-plicate, often sore- 

 diate, beneath black, fibrillose, lobes sinuately- 

 laciniate, rounded tips, apothecia larg-e, chest- 

 nut, marg-in subcrenulate, often sorediate. Ach. 

 S. L. 196, etc. Ver}^ common on oaks every- 

 where. Deer Park, etc. 



P. conspersa, Ehrh., Ach. Thallus straw-colored, 

 g-reenish, laciniate, much divided, appressed, 

 often isidiophorous in the centre, beneath fus- 

 cous-black, sparing-ly nigro-fibrillose, lobes sin- 

 uate, often crenate, or pinnatified, complicate, 

 apothecia larg-e, chestnut, marg-in subcrenulate. 

 Spores ellipsoid, simple. On boulders, trees, etc. 

 PHYSCIA, D. C, Fr., Th. Fn Thallus foliaceous, 

 variously divided, stellate, somewhat fibrillose, 

 apothecia scutell^form. Spores ellipsoid, biloc- 

 ular. 



P. speciosa, Wulf., Nyl. Thallus g-reenish, g-lau- 

 cous, loosely stellate, appressed, beneath corti- 

 cate, rhizins whitish, lobes sinuate, flat, pin- 

 natihd. with powdery margins, apothecia me- 

 diuln size, sessile, margin crenulate, disk fus- 

 cous. Spores bilocular, Parmelia speciosa, 

 Ach. On various trees. Deer Park, Indian 

 Creek, etc. 



P. stellaris, L., Nyl. Thallus albo-glaucescent, 

 stellate, appressed, orbicular, beneath pale, 

 fibrillose, lobes linear, many-cleft, compaginate, 

 or discrete; apothecia small, sessile, disk fus- 

 cous-black, often grey-pruinose, margin entire 

 or crenulate. Parmelia, Fr. h. K., 82. This, 



