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Abstract: Shaking up compost when it was completely colonized by mushroom mycelium resulted in rapid regrowth of mycelium, but little regrowth of mycelial strands. Similar treatment of the casing layer resulted in a rapid redevelopment, although the network of mycelial strands was less dense than in undisturbed casing. Sporophores formed readily on both the undisturbed and shaken-up casing. Experiments showed that shaking-up the casing layer just as the first or second flush was appearing usually reduced the number and weight of sporophores, but increased the average weight per sporophore. The proportion of sporophores that grew as single fruiting bodies was much higher on the trays on which the casing layers were shaken up than on the undisturbed trays, but the number of clumps (including each single sporophore as a clump) was unchanged. Shaking up the casing just as the second flush was appearing delayed subsequent picking more than shaking up as the first flush appeared.
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