126 GEOLOGY OF LA SALLE COUNTY. 



USNKA, (Ach.) Thallus erect or pendulous, g"ray- 

 g-reen, filamentous. Apothecia rounded, sub- 

 terminal, disk open, marg-in ciliate. Of univer- 

 sal distribution in some form. 



U. barbata, (L.) Fr. Occasional on trees and 

 stones in deep woods. 



U. barbata, (L.) Fr. var. fiorida, Fr. Thallus 

 tufted, apothecia large, pale. Infertile often. 

 On trees and shrubs. Deer Park, etc. 

 U. barbata, (L.) Fr. var. livita, Fr. On trees 

 — Abundant. 



CETRARIA, (Ach.) Fr., Mull. Thallus ascendant 

 with compressed, turg-id, or channelled branch- 

 es; or may be expanded and foliaceous-membran- 

 aceous, brown, yellowish, or g^laucescent; apoth- 

 ecia maro-inal or submarg-in^l, scutelaeform, of- 

 ten dilate. Spores sub ellipsoid. 



C. ciliaris, (Ach.) Thallus membranaceous, folia- 

 ceous, sinuate-laciniate, g^reenish or brownish; 

 brownish beneath, fibrillose, lobes crowded of- 

 ten narrowed and cleft, lacunose, apothecia 

 marg-inal, ample; disk chestnut, marg-in crenu- 

 late. Spores subellipsoid. On old log's and 

 rails in various localities. 



C. aleurites, (iVch.) Th. Fr. Thallus, many cleft, 

 isidiod, plicate, g-ranulate, wrinkled, lobes sinu- 

 ate, apothecia marg-inal. On dead wood. Fox 

 River w^oods. 



PARMELIEI. 



THELOSCHISTFS, Norm. (Physcia, Nyl.) Thallus 

 foliaceous or reduced, appressed or ascendant; 

 membranaceous, orang-e or yellowish, apothe- 

 cia scutellseform; disk yellow, orang-e or gfreen- 

 ish -yellow. Spores ellipsoid, polar bilocular or 

 simple. 



