LICHENES 



439 



15. P. Clirysoplltll'llllia, Ack. [Golden-eyed]: Thallus 

 subfoliaceous, cartilagincous-tnembranaceous, lacerate-ramose. red- 

 dish-yellow becoming whitish ; under side whitish ; lobes pinnatifid, 

 plano-convex with the margins fibrillose ; apothecia dark-orange, 

 fibrillose-ciliate, or naked. 



Far. b. exilis, Fr. lobe very narrow ; apothecia with the margins naked. 

 Hub. Trees, and shrubs : frequent. 



SUB-SECTION 2. PHYS'OIA. 



Apothecia at first closed, at length dehiscent; disk thickish, waxy, placed upon the 

 medullary layer; thall^s ascendant, or stellate-appressed. 



16. P. leucomela, Ach. [White $ black]: Thallus car- 

 tilagineous, whitish ; lobes narrow-linear, dichotomous-divaricate, 

 beneath very white, powdery, channelled ; lobes sparingly ciliate 

 with very long simple black fibres. 



Hob. On mostly rocks, and trunks. 



Obs. This beautiful little species is exceedingly rare, and has 

 not been found in fruit, with us. 



lY. P. dctoiisa, Fr. [Shorn] : Thallus cartilagineous, sub- 

 stellate, glaucous-fusccscent and fuscous ; under side whitish, with 

 black fibres ; lobes narrow, linear, gubconvex, digitate-multifid, 

 crowded, imbricate, often semi-terete ; apothecia subsessile, the 

 margin finally creiiato and leafy ; disk plane, becoming dark- 

 fuscous. 

 Hab. Rocks, and tree* : common. 



IS.P.pUlVCrulenlaj-fV. [Powdery]: Thallus cartilagineous, 

 substellate, pruinosc-cinercous ; under side black, hispid-tomentose ; 

 lobes linear, multifid ; apothecia sessile ; disk plane, black-fuscous, 

 subpruinose, the margin tumid, entire, or squamulose-foliose. 

 Hob. Rockp, and ioo*py trunks: frequent. 



19. P. hypolcwca, Muhl. [ While-beneath] : Thallus cartila- 

 gineous, sub.-itcllatc, glabrous, naked, glaucous-vircscent or whitish ; 

 under side very white, with dark fibres ; lobes sublinear, multifid, 

 plano-convex, the margins naked ; apothecia elevated ; disk black, 

 naked, margin inflexed, crenulate, or foliose. 



Hob. Trunks of trees: common. Fertile. 



20. P. spcci v *sa, Ach. [Elegant]: Thallus cartilagineous- 

 membranaceou.*, substellate, glabrous, greenish-glaucous, or whit- 

 ish; under side very white, with pale fibres; lobes linear, incised- 

 rainose, crenate, ciliatc-fibrillose, the margins often green-pul- 

 verulent; apothecia elevated; disk rufous-fuscous, nearly naked; 

 margin incurved, crenate. 



Far. b. gzlactop'tyUa, Tu:kKrm. MS. [P. ciliaris, b. galactophyUa, Tuckerm. 

 Synopsis]: very deliraie, the lobes less crowded, very white and powdery beneath. 

 Jfab. Trees, and among mosses : frequent. Infertile. 



21. P. Stellftris, Wallr. [Star-like] : Thallus snbcartilagin- 

 eous, naked, glauccscent; under side whitish, with dark fibres; 

 lobes sublinear, multifid ; apothecia sessile ; disk fuscous-black, 

 subpruinose ; margin thickish, sub-entire. 



