2 BBITISH LICHENS : 



6. Ephebeia Nyl. ThaUus monoecious ; gonimia 2-4 in each 

 nodule : apothecia in thalline incrassations, with constantly simple 

 spores and distinct paraphyses ; spermogones with simplish sterig- 

 mata and shortly cylindrical spermatia. 



Tribe IV. MAGMOPSEI Nyl. ThaUus pyrenopsidian, contain- 

 ing syngonimia ; gonimia without order : apothecia peridieine. 



7. M agmopsis Nyl. Thallus furfuraceo-squamulose ; syngonimia 

 glomerulose or granuloso-difform, gonimia moderate : apothecia 

 small, with 1-septate spores ; spermogones not seen rightly deve- 

 loped. 



Family II. COLLEMACEI Nyl. Thallus turgid when moist; 

 sometimes with cortical layer ; gonimia moniliform ; medulla not 

 discrete. 



Tribe I. LICHINEI Nyl. Thallus fruticulose or radiately laci- 

 niate, or squamuloso-difform ; gonimia elongately moniliform, 

 subconnate : apothecia lecanorine or lecideine. 



8. Lichiua Ag. Thallus fruticuloso-csespitose ; gonimia arranged 

 chiefly under the cortical layer : apothecia lecanorine, terminal, 

 with simple spores ; spermogones with simple sterigmata and oblong 

 spermatia. 



9. Lichiniza Nyl. Thallus squamuloso-difform, with subglobose 

 papilla? ; gonimia moniliform and radiate in the thalline globules : 

 apothecia lecanorine ?, terminal, with simple spores ; spermogones 

 unknown. 



10. Pterygium Nyl. Thallus radiately laciniate ; gonimia ar- 

 ranged chiefly xmder the cortical layer, usually moniliformly con- 

 crete : apothecia lecideine, with septate spores ; spermogones with 

 jointed sterigmata and straight spermatia. 



11. Leptogidium Nyl. Thallus fruticulose ; gonimia monili- 

 formly concatenate: apothecia subbiatorine, with simple spores; 

 spennogones not seen rightly developed. 



Tribe II. COLLEMEI Nyl. Thallus membranaceous, lobate, 

 rarely granulose, subsquamulose, or fruticulose ; gonimia monili- 

 form ; cortical layer distinct or none : apothecia lecanorine, or 

 rarely pyrenocarpous. 



12. Synalissa Fr. Thallus fruticulose or granulose ; gonimia 

 usually scattered amongst the filaments ; cortical layer obsoletely 

 cellular : apothecia lecanorino-endocarpoid, with simple spores ; 

 spermogones with simplish sterigmata and oblong spermatia. 



13. Schizoma Nyl. Thallus lineari-laciniate ; gonimia arranged 

 chiefly under both surfaces in roundish cells : apothecia unknown ; 

 spermogones with subsimple sterigmata and pistillari-bacillar sper- 

 matia. 



