(>0 ACOTYLEDONs. — LICHENS. Stereocmitoii . 



tliecia flatlisii at the top sometimes conglomerate iedcli*-h brown. 

 Ach. Syti. Lick. p. 280. Lichen byssoides, Ligktf. p. 809. 

 E. B. /.373. 

 IIab. Rocks, old walls and sometimes upon tlie ground, Light/. 



26. ISIDIUM. 

 Universal receptacle, crnstaceous, spreading, plane, adnate, uni- 

 form, bearing solid, shortish podetia. Partial recepl. orbi- 

 cular, convex, at length subglobose, solid, terminal upon the 

 pndetia and more or less sunk into their extremity, so as to 

 leave a margin formed of tlie substance of the podelium. 



1. 1, cnrnirnuim^ crust tartarcous greyish white, podetia at 

 length elongated rounded simple or branched, apothecia 

 brownish grey. Ach. Syn. Lich. p. 281. Lichen curallimis. 

 Light/, p. SOS. E. B. t. 1541. 



Hab. Rocks in the Highlands, not unfrequent, as about Finliirig, in 

 Breadali)aue, Dr. Stuart. Dumfries-shire, Dr. Burget;s. Black- 

 ford, near Edinburgh, Sir James Edicard Smiili. Ascent and top of 

 Ben Lomond, Mr. Turner and Hoolc. Pentland hills, Maugh. 



Podelia small, not ^ of an inch high, much crowded and of a brittle 

 or stony substance, whitish. 



2. I. PVestringiiy crust tartareons thin unecpial cracked and 

 greyish, podetia subglobose at length cylindrical simple and 

 jjranched, apothecia dark brown. /Ich. Syn. Lich. p. 2S2. 

 Lichen IVeslringii, E. B. t. 2204. 



Hab. Rocks among the mountains, Dicks. 



3. I. microslicticum, crust tartareons cracked smoothish nearly 

 even of a brownish cream-colour thinner towards the edges, 

 podetia scattered short hcmisphierical simple of the same co- 

 lour as the crust, apothecia brownish. Turn, and Borr. Li- 

 chcnogr. Brit, inedit, p. 94. Lichen microsticticus, E. B. 

 t. 22 1'S. 



Hab. Rocks in Scotland, Dickson, Dr. Sluart. 

 27. STEREOCAULON. 



Universal receptacle cartilaginous or somewhat woody, branched 

 and shrubby. Partial recept. tmh\uate, sessile, sohd, plane, 

 scarcely rising above a margin formed by the thallus;nt length 

 hemisphaerico-globose, dilated, reflexed below and covering 

 the margin. 



1. S. pascliale, thallus greyish branched and rough wltli 

 granulated excrescences, branches crowded and very much 

 divided, apothecia scattered and terminal at length convex 

 conglomerate blackish brown. Ach. Syn. Lich. p. 284. 

 Lichen paschalis, Light/, p. 8S6. E. B. 1..2S2. 



Hab. Rocks on the Higliland mountains, abundant. Corstorphine 

 and Tentland hills, near Edinb., G. Don, and Mr. E. J. Maughan. 



