TY  - BOOK
AU  - Mason, E.W.
ED  - Ellis, M.B.
TI  - British species of periconia
T2  - Mycalogical papers...; no. 56
U1  - 589.2 
PY  - 1953///
CY  - Kew, Suprey
PB  - The commonwealth Mycalogical Institute
ER  -