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Hymenoscyphus aesculi: a–b. petiole in median section, showing black stroma and erumpent apothecial growth; pseudosclerotial plate occurring between cortical parenchyma and sclerenchyma but also between sclerenchyma and vascular bundle (phloem/xylem). – a–b. H.B. 9701 (DE-HS, Darmstadt).
