Webster, J. 1952: Graminicolous Pyrenomycetes. IV. Microthyrium nigro-annulatum n.sp. and M. gramineum. Transactions of the British Mycological Society 35(3): 208-24.
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| Webster, J. 1952: Graminicolous Pyrenomycetes. IV. Microthyrium nigro-annulatum n.sp. and M. gramineum. Transactions of the British Mycological Society 35(3): 208-24. |