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Induction conditions of mitotic sporogenesis. (a) Conventional cultivation in a 1 cm-high plate without the presence of mitospores. (b,c) Abundant mitospore formation in a 1.5 cm high cultivation plate (b) and a 10 cm height culture bottle (c). (d) Close-up picture showing abundant mitospore mat formation (arrowed) on both the container walls or over the pine needle surface.
