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(A) Control plant of lettuce, non-infected by R. solani and Olpidium sp. (B) Stem base with browning of lower leaves (C) and stunted top-soil fine roots of lettuce (cv. Tizian) infected by R. solani AG1-IB (D) with fungal hyphae showing rectangular branching (E). Root system (F) and fine root tips of lettuce seedlings infected by naturally occurring Olpidium sp. with typical dark colored lines in xylem. (G) Sporangia formation in the root tissue by Olpidium sp.
