SYNOPSIS OF THE FAMILIES, TRIBES, AND 
GENERA OF BRITISH LICHENS. 
Family I. EPHEBACEI Nyl. Thallus slightly turgid when 
moist, cellular within ; gonimia tunicated, not moniliform, 
Tribe I. SIROSIPHEI Nyl. Thallus filamentoso-fruticulose ; 
gonimia variously connate: apothecia biatorine or lecideine. 
1. Gonionema Nyl. Thallus fibrillose, tubuliform ; gonimia con- 
nate in one continuous series: apothecia biatorine, with simple 
Spores and paraphyses ; spermogones with simple sterigmata and 
minute oblong spermatia. 
2. Spilonema Born. Thallus fruticulose, cylindrical, often pul- 
vinate ; gonimia connate in transverse layers: apothecia lecideine, 
with simple or 1-septate spores and articulate paraphyses ; spermo- 
gones with jointed sterigmata and shortly cylindrical spermatia. 
Tribe II. PYRENOPSEI Nyl. Thallus thinly granulose, rubri- 
cose within; gonimia simple or connate: apothecia lecanorine or 
pyrenocarpous. 
3. Euopsis Nyl. Thallus granulato-areolate; gonimia simple 
or nodulose: apothecia lecanorine, with articulate paraphyses and 
simple spores; spermogones with simplish sterigmata and minute 
oblong spermatia. 
4. Pyrenopsis Nyl. Thallus granulato-areolate or subsquamu- 
lose ; gonimia simple or nodulose: apothecia pseudo-pyrenocarpous, 
with simple paraphyses and spores; spermogones with simplish 
sterigmata and minute oblong spermatia. 
Tribe ITI. HOMOPSIDEI Nyl. Thallus either fruticulose, with 
seriate gonimia; or squamuliform or granulose, with subsolitary 
gonimia: apothecia pyrenocarpous. 
Subtribe EPHEBEI Ny]. Thallus fruticulose, intricate, dice- 
cious or moncecious; gonimia nodulose: apothecia pyrenocarpous, 
with or without paraphyses. 
5. Ephebe Fr. Thallus dicecious ; gonimia 2-4 in each nodule: 
apothecia in thalline incrassations, with simple or 1-3-septate spores 
and no paraphyses; spermogones with simplish sterigmata and 
shortly cylindrical spermatia. 
B 
