. Fi(!. 160.—Ustilago tritici. Wheat-smut. The central ear is normal and liealthy, the others are smutted and most of the spores ai'e already shed, (v. Tubeuf phot.) with a sporogenous mycelium from which arise the spore-masses; these are at first enclosed in whitish coverings consisting of tissues of the host-plant, but when mature they escape as a black dust or powder.

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi