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Oersted first proved that the other part of its life is spent on the leaves of certain Rosaceæ, and his discovery has been repeatedly confirmed. I have myself observed the following confirmation of this. Many other well established cases of similar heteroecism could be quoted. But we must return to the Peridermium Pini.
Hartig, for instance, to whose indefatigable and ingenious researches we owe most that is known of the disease caused by the Peridermium, has confirmed Wolff's results. It was to the brilliant researches of the late Prof. De Bary that we owe the first recognition of this remarkable phenomenon of heteroecism i.e., the inhabiting more than one host of the fungi.
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