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Amylostereum stillwellii. A. Typical site in California where S. areolatus, S. californicus and other Siricids carrying A. stillwellii occur (Photo credit Danny Cluck). B. Specimens of S. areolatus (top) and S. californicus (bottom). C. Colony on MEA after 4 wk. D. Hyphae with clamp connections. Scale bars = 10 μm.
