Keys to the genera of amerospored and didymospored pyrenomycetes /
Arx, J.A. von.
Müller, Emil.
Butterfill, G.B.
Commonwealth Mycological Institute (Great Britain)
Kew Commonwealth Mycological Institute
1969
Translated from 'Beiträge zur Kryptogamenflora der Schweiz', Band 11. Bern: Büchler, 1954 & 1962
Pyrenomycetes.