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Oogonia from an IC1/A1 × IC2 /A2 pairing (isolates VN160 × VN314) with amphigynous antheridia (black arrows); structures stained with lactophenol blue. (A) Oogonium containing a viable oospore with a thick well-developed wall (red arrow), an oily granular matrix and a globose lipid vacuole (yellow arrow). (B) Oogonium containing an aborted oospore with a thin irregular wall (red arrow), a glassy refractive matrix with a disorganised vacuole (yellow arrow). Scale bar = 20 μm.
