OF GREAT BRITAIN. 



Tribe II. Sph^rophorei. 



Apothecia terminal, nucleiform, globose, irregularly dehiscent ; 

 spores sphserical, violet-black. = Sph^rophoron. 



Series II. CLADODEI. 

 Tribe III. B^omycei. 



Thallus gelatinoso-conglutinate ; apothecia stipitate clavato- 

 capitate ; spores filiform, multiseptate. = Gomphillus. 



Thallus crustaceo-granulose or subsquamulose ; apothecia stip- 

 itate or sessile, biatorine. =B^:omyges. 



Tribe IV. Cladoniei. 



Thallus foliolose, or squamulose, or granuloso-crustaceous ; 

 podetia fistulose, laciniato-ramose or scyphose ; apothecia terminal, 

 biatorine, livido-fuscous or scarlet. =Gladonia. 



Thallus verrucoso-granulate, bearing large fuscescent sessile 

 cephalodia ; podetia rigid, simple, minute ; apothecia te rminal 

 subglobose, black. =Pilophoron. 



Tribe V. Stereocaulei. 



Podetia covered with variously-shaped fragile granules ; apo- 

 thecia fuscous ; spores cylindraceo-fusiform, 3-9-septate ; cephalodia 

 verrucoso-glomerulose. = Sterbocaulon. 



Series III. RAMALODEI. 



Tribe VI. Roccellei. 



Thallus fruticulose, from a common base, terete or compressed ; 

 spores oblong or fusiform, 3-septate. = Roccella. 



Tribe VII. Siphulei. 



Thallus of prostrate subulate stipites, acute at the apices, fistu- 

 lose. = Thamnolia. 



Tribe VIII. Usneei. 



Thallus filamentose, pale cinereo-virescent ; apothecia concolo- 

 rous. = Usnea. 



Tribe IX. Ramalinei. 



Thallus cylindrical, horny; spores simple. = Aleotoria. 

 Thallus applanate, flaccid; spores simple. =Evernia. 

 Thallus compressed, rigescent ; spores 1-septate. = Ramalina. 



