10 
INDEX LICHENUM BRITANNICORUM. 
(According to the most recent Nylanderian Arrangement.) 
By the Rev. J. M. Crombie, F.L.S. 
PART I. 
Family I. EPHEBACEI, Nyl. 
Tribe I. SIROSIPHEI, Nyl. 
Genus I. Gonionema, Nyl. 
Sp. 1 G. velutinum ( Ach .), Nyl. 
2 G. compactum ( Ag.), Nyl. 
Genus II. Spilonema, Bom. 
Sp. 1 Sp. paradoxum, Born. 
2 Sp. revertens, Nyl. 
3 Sp. Scoticum, Nyl. 
Tribe II. PYRENOPSEI, Nyl. 
Genus I. Euopsis, Nyl. 
Sp. 1 Eu. hsemalea ( Smmrf, .), Nyl. 
2 Eu. granatina ( Smmrf, 1), Nyl. 
Genus II. Pyrenopsis, Nyl. 
Sp. 1 P. haunatopis (Smmrf.), Nyl. 
2 P. fuscatula, Nyl. 
3 P. subareolata, Nyl. 
4 P. phylliscella, Nyl. 
5 P. homceopsis, Nyl. 
6 P. furfurea, Nyl. 
Tribe III. HOMOPSIDEI, Nyl. 
Sub Tribe I. Ephebei, Nyl. 
Genus I. Ephebe, Nyl. 
Sp. 1 E. pubescens ( L .), Nyl. 
Genus II. Ephebei a, Nyl. 
Sp. 1 E. hispidula (Ach.), Nyl. 
* E. Martindalei, Cromb. 
Tribe IV. 3YIAGMOPSEI, Nyl. 
Genus I. Magmopsis. 
Sp. 1 M. argilospila, Nyl. 
