The fungi present in the raw humus under black spruce in the boreal forest of Quebec were studied by the soil-washing technique. Penicillium, Pullularia, and yeasts together comprised 75–94% of isolates from the washings and 42–77% of those from the washed particles. There was evidence that Penicillium spp. existed to a significant extent in the mycelial state. Aspergillus and Tricho-derma spp. were absent or rare. The possible ecological significance of the high incidence of Pullularia and yeasts is discussed.
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Reddy et al. (1965) studied this question.
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