THE OCCURRENCE IN NATURE OF MUTUAL AVERSION BETWEEN MYCELIA OF HYMENOMYCETOUS FUNGI

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Abstract
A specimen of Corticium calceum Fr. discovered in the herbarium of the University of Toronto is clearly an example of the barrage phenomenon in nature. Two mycelia differing both in color and texture grew toward one another on the wood substratum and between them there developed a clearly defined gap or barrage. The gap is plainly not the work of insects and judging from several characters is a true barrage developed under natural conditions. Careful search among fungi which form flat expanses of mycelium (such as the Thelephoraceae) may show that the barrage effect occurs commonly in nature.

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