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Hard maple, 64ft clear stem; Height 110ft.

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Hard maple, 64ft clear stem; Height 110ft. DBH 17in, 400 fbm/tree. Geo. Barrie woodlot, Highway 97 near Ayr.

Cronartium comptoniae (sweetfern blister rust) on 2 year jack pine.

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Cronartium comptoniae (sweetfern blister rust) on 2 year jack pine. N.B. aeciospores.

Cronartium comptoniae (sweetfern blister rust) on 2 year jack pine.

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Cronartium comptoniae (sweetfern blister rust) on 2 year jack pine. N.B. aeciospores.

Cronartium comptoneae rust showing aeciospores.

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Cronartium comptoneae rust showing aeciospores on jack pine.

Cronartium comptoneae rust showing aeciospores.

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Cronartium comptoneae rust showing aeciospores on jack pine.