SYNOPSIS OF THE FAMILIES, TRIBES, AND 

 GENEBA OF BRITISH LICHENS. 



Family I. EPHEBACEI l^yl. ThaUus sHghtly turgid when 

 moist, cellular within ; gonimia tunicated, not moniliform. 



Tribe I. SIROSIPHEI Xyl. ThaUus filamentoso-fruticnlose ; 

 gonimia variously connate : apothecia biatorine or lecideine. 



1. Gonionema Xyl. ThaUus fibriUose, 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 Bom. ThaUus 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 n. PYRENOPSEI Nyl. ThaUus thinly granulose, rubri- 

 cose within ; gonimia simple or connate : apothecia lecanorine or 

 pjTenocarpous. 



3. Euopsis K'yl. ThaUus granulato-areolate ; gonimia simple 

 or nodulose : apothecia lecanorine, with articulate paraphyses and 

 simple spores ; spermogones with simpHsh sterigmata and minute 

 oblong spermatia. 



4. Pyrenopsis Xyl. ThaUus granulato-areolate or subsquamu- 

 lose ; gonimia simple or nodiUose : apothecia pseudo-pyrenocarpous, 

 with simple paraphyses and spores ; spermogones with simpUsh 

 sterigmata and minute oblong spermatia. 



Tribe III. HOMOPSIDEI K'yl. ThaUus either fruticulose, with 

 seriate gonimia; or squamuliform or granulose, with subsoUtary 

 gonimia : apothecia ppenocarpous. 



Subtribe EPHEBEI Xyl. ThaUus fruticulose, intricate, dioe- 

 cious or monoecious ; gonimia nodulose : apothecia pyrenocarpous, 

 with or without paraphyses. 



5. Ephebe Fr. ThaUus dioecious ; gonimia 2-4 in each nodule : 

 apothecia in thaUine incrassations, with simple or 1-3-septate spores 

 and no paraphyses ; spermogones with simpUsh sterigmata and 

 shortly cylindrical spermatia. 



