Sticta.] 



LICHENES. 151 



times on the middle of the segments of the thallus ; they first appear 

 as pale-chesnut coloured elevations of the cuticle, then with a central 

 depression, and more raised above the surface ; finally, sessile on a 

 conical elevation of the thallus ; the disk at length convex. On the 

 centre of the disk, a cup with a corrugated margin sometimes occurs ; 

 it is figured by Dillcnius t. 29, /. 115, I have not been able to observe 

 any disk within to justify the appellation of young apothecia. Under the 

 microscope, the disk appears lentiform ; the perithecium like two layers 

 of a chesnut-brown colour, enclosing a pale gelatinous lamina. States 

 occur with segments as linear and concave as in <S. damcecornis Ach. 

 ( as figured in Hoffm. PL Lich. t. 34, /. 1 — 7, and in Dillenius above 

 quoted,) of which, I have little doubt, our plant is but a variety, and 

 to which the specific name of dameecornis should perhaps be imme- 

 diately restored. 



2. S. crocata, Ach. Thallus coriaceous, sinuated, olive- 

 brown, reticulated with elevated ridges, which, as well as the 

 margins, bear lemon coloured buds ; cyphella? lemon-coloured ; 

 " apothecia brownish-black, with an entire border." Ach. L. 

 Un. p. 447. Eng. Bot. .211 0. 



On basalt, at Faiihead, Mr. Templeton. On Pigeon Island, in the 

 River Kenmare; in both instances without apothecia. The thallus 

 above in cup-shaped eruptions contains the buds, in the form of a fine 

 powder of a sulphur yellow ; in this a strongly magnifying lens shows 

 pale filaments, aggregate, attached by one end, overtopping the surface 

 of the powder by the other : these must not be confounded with other 

 bodies in the powder, having pale somewhat cylindrical stems on which 

 are placed dark brown balls. The lemon coloured globules on the un- 

 derside are not in any assigned cavities, and contain not the bodies just 

 described, yet some are observed to turn of a dark olive colour. 



3. S. pulmonaria, Hook. Thallus coriaceous, glaucous- 

 green or pale, lacunoso-reticulate ; lobes sinuato-laciniate, re- 

 tuso-truncate ; buds clustered, clavate, their tops brown ; cy- 

 phellce, pale, naked, convex spots ; apothecia reddish-brown ; 

 their border at length of the same colour. Hook. Eng. Fl. v. 

 5, p. 206. S. pubnonacea, Ach. L. Un. p. 449. Eng. Bot. t. 

 bli. 



In woods; common. The buds may be observed to expand into 

 new fronds ; and the older apothecia sometimes exhibit rudiments of 

 younger growing upon their disk. Patches occur in the woods near 

 Kiliamey 3 — 4 feet in diameter, accompanying Parmelia herbacea. 



4. S. scrobiculata, Ach. Thallus coriaceous, smooth, deeply 

 and broadly lobed, glaucous-green ; the margin subcrenate ; 

 buds submarginal, at length confluent, in a fine ash-grey pow- 

 der ; cyphellce pale, naked, convex spots ; apothecia scattered ; 

 the disk flattish, brown ; the border subcrenate. Ach. L. Un. 

 p. 453. Eng. Bot. t. 497. 



On rocks near Bantry, Miss Hutchins. The buds at first appear 

 as rough, subrotund, brown grains ; but at length a coarse granular 

 dark powder is found among them, probably an incipient state of ger- 

 mination. 



