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SEM photos from the in vitro inoculation of leaf discs of P. trichocarpa with an endophytic strain of Penicillium citrinum 0079. (a) Low magnification view of lower epidermis, six HAI; (b) Non-germinated conidia are dispersed on lower epidermis, 24 HAI; (c) Non-germinated conidia at high magnification, 24 HAI; (d) Germinated and non-germinated conidia at high magnification, 48 HAI; (e) Germinated conidia and hyphae, as well as non-germinated conidia, on lower epidermis, 48 HAI.
