Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 130 MORPHOLOGY. (figs. 147-150). These two forms occur on the stems, blades, etc., of the wheat, also on oats, rye, and some of the grasses. 290. Teleutospores of the black-rust form.—If we scrape off some portion of one of the black pustules (sori), tease it out Fig. 150. Head of wheat showing black rust spots on the chaff and awns.

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