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Polyporus is a large genus of which one of the best known species is P. betulinus, a destructive parasite of birch, but including also species parasitic on economically valuable trees, such as oak, beech and many conifers.

— Lilian Hawker Fungi: An Introduction (1960)

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The rusts are highly specialised obligate parasites of flowering plants, conifers and ferns. The cereal rusts are amon the most destructive pathogens of economic plants ...

Fungi: An Introduction (1960)

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