436 THALLOPHTTES 



3* P. polydactyla, Hoffm. {Many-fingered} : Thallus papyr- 

 aceous, very smooth, shining, rufescent, or plumbeous- virescent ; 

 under side nearly naked, reticulated with spongy fuscous veins ; 

 fertile lobules suberect ; apothecia numerous, revolute. 

 Sab. On mossy rocks; trunks of trees, &c.: common. 



59?. STICTA, Ach. 



[Gr. Stiktos, dotted; from the depressed spots under the thallus.] 

 Apothecia scutellaeform, centrally adnate either to the disk, or mar- 

 gin of the thallus, oblique, nucleiform, becoming elevated and ex- 

 planate. Thallus coriaceous-cartilagineous, villous beneath, with 

 small urceolate cavities (cyphellae}, or soredia, or discolored naked 

 spots. 



1* S. aurata, Ach. {Gilded}: Thallus subcoriaceous, reddish 

 brick-colored ; under side lanuginous, with the margin reddish-yel- 

 low; cyphellae yellow, often sorediiform ; lobes rounded, wavy, 

 sinuate-cut, crisped, yellow-pulverulent ; apothecia marginal, plane, 

 fuscous-red, margin inflexed. 

 Sab. On mossy trunks of trees : not common. Infertile. 



2. S. sylvatica, Ach. [ Wood } : Thallus eoriaceous-membran- 

 aceous, lacunulose, laciniate-lobed, greenish-fuscous ; under side 

 tomentose, pale fuscous, with small whitish urceolate cyphellae ; 

 lobes rounded- truncate, crenulate; apothecia marginal, peltate, 

 rufous-fuscous. 



Sab. On rocks, among mosses : common. Infertile. 



3. S. Plllmonaria, Ach. {Lungwort} : Thallus coriaceous, 

 lax, lacunose-reticulate, dark green, or olivaceous ; under side 

 tomentose, with large white naked spots ; lobes elongated, sinuate- 

 laciniate, retuse-truncate ; apothecia sub-marginal, rufous. 



Sab. On trunks of trees, and rocks : very common. Infertile. 



4. S. glomerulifera, Delis. {Glomerule-bearing} : Thallus 

 coriaceous-cartilagineous, thick, orbicular, appressed, smooth, pale 

 glaucous-green ; under side villous, the excavated cyphellae often 

 wanting; lobes elongated, sinuate; apothecia large, scattered, dark 

 chestnut, with a rugose persistent margin. 



Sab. On trunks of trees, and rocks : common. Fertile. 



598. PARMEXIA, Ach. 



[Qr. Panne, a small shield, and eileo, to surround ; the apothecia being bordered.] 

 Apothecia scutellaeform, orbicular, adnate horizontally to the disk 

 of the thallus, with an equal thalline margin ; disk at first conni- 

 vent-closed, somewhat waxy. Thallus expanded horizontally from 

 a centre, two-sided, of various form, upon a hypothallus. 



SECTION 1. 



Thallus foliaceous ; hypothallus fibrillose, adnate to the thallus, discrete from the 

 matrix. 



SUBSECTION 1. IMBRICXRIA. 



Apothecia elevated, subpedicellate ; disk very thin, naked, seated on the gonimons 

 ayer; thallus imbricate-foliaceous, often black-dotted. 



