438 THALLOPHYTES 



9. P.colpodes, Ach. [Bosom-like]: Thallus somewhat inflated, 

 suborbicular, greenish-glaucescent ; under side black and spongy ; 

 lobes somewhat plane, ramose-multifid, irregularly dentate ; apothe- 

 cia chestnut-color, elevated, margin iufiexed, entire. 



Hob. Trunks of trees: -very common. 



SERIES 2. OLIVACEO-FTJS'CAE. 



10. P. Olivarea I Ach. [Olive-colored']: Thallus membrana- 

 ceous, smooth, rugulose (elevated-punctate, or granulate-farinose), 

 olivaceous-fuscous ; under side paler, subfibrillose ; lobes oppressed, 

 radiate, rounded, crenate ; apothecia dark-olive, with an inflexed, 

 and finally crenate, margin. 



Hob. Trees : somewhat rare. Small. 



SERIES 3. OCHROLEU V CAE. 



11. P. caperala, Ach. [Wrinkled]'. Thallus submembrana- 

 ceous, orbicular, rugose, or granulosc-pulvcrulcnt, ochrolcucous ; 

 under side blackish, sparingly fibrlllose ; lobes sinuatc-laciniate, 

 rounded and subcntire at apex ; apothecia fuscous-red, with a tumid 

 incurved rugose-crenate margin. 



Sab. Trunks ; rails ; stones, &,c. : very common. Seldom fertile. 



12. P. COIlSpersa, Ach. [Sprinkled]: Thallus membrana- 

 ceous, smooth, polished (or oftcncr sprinkled with black dots), 

 greenish-straw-colored ; under side fuscous and blnck-fibrillose ; 

 lobes fiexuose, sinuate, somewhat plane ; apothecia dark-che.stnut, 

 sub-entire, mostly numerous. 



Var. b. stenophylla< Ach. lobe? elongated, linear, pinnatifid, imbricate complicate. 

 Bab. Rocks, and stones : very common. Fertile. 



13. P. centriflisrn, I Ach. [Centrifugal]: Thallus sub-mem- 

 branaceous, orbicular, groonish-straw-colcr, or ochrolcucous; under 

 side white and fibrillose (the crust-like centre often falling away, 

 and leaving a concentrically disposed circumference) : lobes linear, 

 convex, concrete, rugose ; apothecia rufous-fuscous, sub-entire. 

 Hob. Rocks: not common. 



SERIES 4. CITRI\NAE. 



14. P. pariettna, Fr. [ Wall] : Thallus membranaceous, 

 foliaceous, or squamulosc, imbricate, sublobiitc, yellow ; under side 

 paler and obsoletcly fibrillose ; apothecia with elevated very entire 

 margins. Polymorphous. Wo find the following varieties : 



Var. &.foli<2cea, Fr. thallua foliaceous, greenish passing to yellow ; lobe? appress- 

 ed, explanate. 



Var. b. rutilans. Fr. thallus foliaceous subcrustaceous, imbricate-oom plicate, 

 irregularly laciniate. 



Var. c. laciniosa, Fr. thallus lacerate-dissected, pquamulope; lobes ascending, 

 naked. 



Var. A, polycdrpa, Fr. thallus smaller, conglomerate; lobes complicate; apothe- 

 cia very numerous. 



Var. e. citrinella, Fr. thallus wholly dissolved into a yellowish-green dust. 

 Hob. Rocks; old walls; trunks, dead wood, Ac.: common. 



