Association between living roots and ascocarps of Morchella rotunda

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Ascocarps of Morchella rotunda are joined by subterranean hyphal systems to ‘mycelial muffs’ surrounding living roots of various plants. From the ‘mycelial muffs’ the fungus penetrates into the root tissues as far as the vascular cambium, and grows predominantly intra-cellularly, especially within young secondary phloem. Formation of this close association with plant roots may represent a critical stage, concerned with elaboration of the ascocarps, in the life-cycle of this otherwise putatively saprotrophic fungus.

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