Slereocaulon.] LICHENES. 83 



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

 f Apothecia internally pulverulent. 



6. SPH^SROPHORON. 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 csespitose, 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 <y. 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, caespitose, 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, theirjnargin 

 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,/. 1. L. Un. p. 582. 

 Borrer 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 



