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Microscopic appearance of hyphae of S. commune UAMH 8729. (A) Hyphae of the primary isolate formed spicules but lacked clamp connections at the septa. (B) Clamp connections formed on hyphae in the contact zone between a pairing of the case isolate and an isolate obtained from a single basidiospore (UAMH 7694). The arrow indicates a clamp connection. Magnification, ×580.
