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Those first produced have numerous papillæ on them, and were called Uredospores, from their analogies with the uredospore of the rust of wheat; the second kind of spore is smooth, and is called the Teleutospore, also from analogies with the spores produced in the late summer by the wheat rust.
It puts forth the long, branched germinal hyphæ on the damp surface of a leaf of Senecio, and one of the branches enters a stoma, and forms a mycelium in the leaf: after some time, the mycelium gives rise to the uredospores and teleutospores of Coleosporium Senecionis. If I left the matter stated only in this bald manner, it is probable that few of my readers would believe the wonder.
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