Slereocaulon.] LICHENES. 83 



* * * Apothecia on the sublinear branches of a subcrect thallus. 

 \ Apothecia internally pulverulent. 



6. Sph^rophoron. Ach. 



Thallus crustaceo-cartilaginous, branched, suberect, solid. 

 Apothecia subglobose, terminal, exteriorly formed of the 

 thallus, enclosing a black powdery mass, bursting with a torn 

 margin. 



1. S. coralloides, Ach. Thallus cartilaginous, shrub-like; 

 apothecia when young globose. Ach. L. Un. p. 585. Eng. Bot. 

 t. 115. ft. fragile ; thallus densely caespitose, branches short, 

 naked. Ach. L. 17. p. 585. Eng. Bot. t. 2474. 7. compressum; 

 thallus compressed ; old apothecia flat. Ach. L. Un. p. 586. 

 Eng. Bot. t. 1541, 



On rocks in the mountains ; common. The variety 7. at first ap- 

 pears to be distinct, but I have found the flattened apothecia with a 

 subreflexed border upon a thallus quite cylindrical, supposed peculiar 

 to the two first. There is a state of this species deserving- of notice, 

 with the thallus very short, white, csespitose, with the erect branches 

 tipped with roundish, shining, greenish-dun coloured bodies, less in 

 diameter than the branches, which open, at length, on their sum- 

 mits, turn black, and emit, on pressure, a semitransparent mass of 

 aggregate points. 



f f Apothecia interiorly solid. 



1 . Apothecia turbinate, at length globose. 



7. Stereocaulon, Ach. 



Thallus dense, nearly woody, branched, and shrub-like, or 

 crustaceous. Apothecia stalked, turbinate, solid, marginate, 

 at first plane, at length hemispherico-globose, their margin 

 evanescent. 



1. S. paschale, Ach. Thallus greyish, branched, granulato- 

 fibrillose, the branches crowded and much divided ; apothecia 

 scattered and terminal, at length convex, conglomerate, waved, 

 blackish-brown. Ach. L. Un. p. 581. Eng. Bot. t. 282. 



On rocks in the mountains ; common. A dwarf variety occurs at 

 Blackwater, County of Kerry, which answers to the characters of S. 

 botryosum, Ach. 



2. S. Cereolus, Ach. Meth. Thallus tartareous, in clustered, 

 convex, sublobate, rugged, greyish-white warts, on a brownish 

 substratum. Podetia short, of the substance of the substratum, 

 covered with thallodal granules. Apothecia black, very convex, 

 somewhat shining. Ach. Meth. p. 316, t. 7,f. 1. L. Un. p. 582. 

 Borrcr in Eng. Bot. Supp. t. 2667. 



On rocks, near Dunkerron. The substratum, where thickest, is 

 cracked ; it sometimes rises in blackish-brown subrotund masses above 



