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Fig. 4. Microscopic features of Cephaleuros infection on oolong tea (Camellia sinensis) leaves in Fenghuang, Chaozhou, Guangdong. A, Enlarged upper surface lesion. B, Tufts of sporangiophores with zoosporangia on the lower surface at a lesion. C, Higher-magnification view of sporangiophore tufts with zoosporangia. D, Initial infection site with immature gametangia (ga). E, Transverse section of a lesion showing subepidermal thalli (arrows) beneath both surfaces, with necrosis of epidermal (ep), palisade (ps), and spongy (sp) tissues. F, Transverse section of a healthy leaf. Images in A, B, E, and F were taken at 100× magnification, and images in C and D were taken at 400× magnification.