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Basil leaf infected with Peronospora belbahrii. (A) Distinct staining of characteristic branched sporangiophores and sporangia after one week of inoculation. (B) Direct germination of sporangia and penetration through stomata (arrows) 48 h after inoculation. (C) High resolution of differential staining of sporangiophores bearing elliptical sporangia. (D) Sporangiophores emerging from stomata.
