2 BRITISH LICHENS : 
6. Ephebeia Nyl. Thallus monecious; 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. Thallus pyrenopsidian, contain- 
ing syngonimia; gonimia without order: apothecia peridieine. 
7. Magmopsis Nyl. Thallus furfuraceo-squamulose ; syngonimia 
glomerulose or granuloso-difform, gonimia moderate: apothecia 
small, with 1-septate spores; spermogones not seen rightly deve- 
loped. 
Family 11. 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, Lichina Ag. Thallus fruticuloso-cespitose; 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 
papille; 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 under 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 ; 
spermogones 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. 
