Irwin M. Brodo, William Louis Culberson, Haematomma pustulatum, sp. nov. (Ascomycotina, Haematommataceae): A Common, Widespread, Sterile Lichen of Eastern North America, The Bryologist, Vol. 89, No. 3 (Autumn, 1986), pp. 203-205
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Brodo et al. (1986) studied this question.
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