. First forms of vegetation. Botany; Cryptogams. 398 FIRST FORMS OF VEGETATION. still more injurious fungus is developed called bunt {Tilletia caries. Fig. 45). In this disease the seeds re- tain their original form and appearance; indeed, the bunted grain is plumper and of a brighter green '^/jlfl than the rest, but the ' ' inside is completely converted into one mass of black dust of an exceedingly fetid odour, and greasy to the Fig. 46.—PocciNiA Graminis. {(i) Slightly magnified, {b) Sporidia, highly magnified. The surfacc of the spores is beautifully reticulated. When the wheat is
. First forms of vegetation. Botany; Cryptogams. 398 FIRST FORMS OF VEGETATION. still more injurious fungus is developed called bunt {Tilletia caries. Fig. 45). In this disease the seeds re- tain their original form and appearance; indeed, the bunted grain is plumper and of a brighter green '^/jlfl than the rest, but the ' ' inside is completely converted into one mass of black dust of an exceedingly fetid odour, and greasy to the Fig. 46.—PocciNiA Graminis. {(i) Slightly magnified, {b) Sporidia, highly magnified. The surfacc of the spores is beautifully reticulated. When the wheat is thrashed, the infected grains, which retain their original shape to the last, are crushed, and the spores, being thus dispersed, adhere to the sound grains by means of the oily matter which they contain. Bunted wheat contains an acrid oil, putrid gluten, charcoal, phosphoric acid, phosphate of ammonia and magnesia, but no traces of starch, the essential ingredient in human food. When the black powder is accidentally mixed with the flour, it gives it an exceedingly disagreeable taste,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Macmillan, Hugh, 1833-1903; Macmillan, Hugh, 1833-1903. Footnotes from the page of nature. London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1874
