(1962). Studies on the Organisms Associated with "Snow-Blight" of Conifers in North America. II. Some Species of the Genera Phacidium, Lophophacidium, Sarcotrichila, and Hemiphacidium. Mycologia: Vol. 54, No. 5, pp. 481-497.
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Reid et al. (1962) studied this question.
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