66 ACOTYLEDONS. LICHENS. Stercocaiilon. 



tliecia flattish at the top sometimes conglomerate reddish brown, 

 Ach. Syn. Lich. p. 280. Lichen lyssoides, Liglitf. p. 809. 

 E. B.t.373. 

 HAB. Rocks, old walls and sometimes upon the ground, Lightf. 



26. ISIDIUM. 



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

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

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

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

 leave a margin formed of the substance of the podetium. 



1. I. corall'muni) crust tartareous greyish white, podetia at 

 length elongated rounded simple or branched, apothecia 

 brownish grey. Ach. Syn. Lich. p. 281. Lichen corallinus, 

 Lightf. p. 808. E. B. t. 1541. 



HAB. Rocks in the Highlands, not unfrequent, as about Finlarig, in 

 Breadalbane, Dr. Stuart. Dumfries -shire, Dr. Burgess. Black- 

 ford, near Edinburgh, Sir James Edward Smith. Ascent and top of 

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



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

 or stony substance, whitish. 



2. I. IVestringii, crust tartareous thin unequal cracked and 

 greyish, podetia subglobose at length cylindrical simple and 

 branched, apothecia dark brown. Ach. Syn. Lich. p. 282. 

 Lichen Westrmgii, E. B. t. 2204. 



HAB. Rocks among the mountains, Dicks. 



3. I. microsticticum, crust tartareous cracked smoothish nearly 

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

 podetia scattered short hemispherical simple of the same co- 

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

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

 J.2213. 



HAB. Rocks in Scotland, Dickson, Dr. Stuart. 

 27. STEREOCAULON. 



Universal receptacle cartilaginous or somewhat woody, branched 

 and shrubby. Partial recept. turbinate, sessile, solid, plane, 

 scarcely rising above a margin formed by the thallus, at length 

 hemisphaerico-globose, dilated, reflexed below and covering 

 the margin. 



I. S. paschale, thallus greyish branched and rough with 

 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, Lightf. p. 886. E. B. t. 282. 



HAB. Rocks on the Highland mountains, abundant. Corstorphine 

 and Pentland hills, near Edinb., G. Don, and Mr. E. J. Mauglian. 



