GEOLOGY OF r.A SALLE COUNTY. 



131 



PELTIGKRA, Willd., Hofem., Fee. Tliallus mem- 

 branaceous, lobate, frondose, foliaceous, beneath 

 somewhat villous, marked with veins, occasion- 

 ally cyphels, apothecia peltseform. Spores fusi- 

 form. Cortical layer,' in some species consisting* 

 of g-onidia, in others of g-onimia. 



P. rufescens, Neck, HofFm. Thallus larg-e, coria- 

 ceous, rotund, lobate, lobes elevated and crisp, 

 ash colored to reddish brown, beneath reticu- 

 lated with brown veins, fibrillose, apothecia on 

 lobules, larg'e, disk revolute, rufo fupcous. 

 Spores acicular. Common on earth in many 

 localities, in woods along* streams. . :,tfr.' 5. 



P. polydactyla. Neck, Hoffm. Lobes elongated, 

 clustered, thin, g-reenish or lead-colored. At 

 Bailey's Falls on rocks. 



P. canina, L., Hoffm. Thallus larg-e, round-lobed, 

 cinerascent or brownish, apothecia roundish, 

 disk reddish, brown. On rocks. 



PANNARIFL - ■ - 



HEPPIA, Naeg*. Thallus squamose-foliaceous, mo- 

 nophyllous, Gonimous layer of g-onimia, apothe- 

 cia round, immersed. Spores ovoid. 

 H. despreauxii, Mont., Tuckerm. Thallus small, 

 round, smooth, or regfulose, gfreen, apothecia 

 separate, or in rosettes, sunken in thallus, disk 

 reddish or salmon-colored. On mossy, clayey 

 earth in woods. Very small, hoc. Deer Park. 



PANNARIA, Delis. Thallus squamulose, subfolia- 

 ceous or monophyllous, the hypothallus spongy 

 or obsolete, apothecia scutellaeform, with both 

 thalline and proper margfins, frequently biato- 

 rine. Gonimous layer of both g-onidia and 

 gonimia. v 



