. Botany of the living plant. Botany. EU-MYCETES. ASCOMYCETES 437 wliich causes a disease on Rye-crops. The fungus attacks the ovaries of the Rye and other Grasses at the flowering period, spreading over them and causing the condition known as " ; This is the conidial stage, and it is spread from plant to plant by insects, which are attracted by a sugary secretion in which the conidia float (Fig. 369, rt, b ; also Fig. 341, p. 406). But the effect becomes more apparent as the crop ripens, for in place of the normal grains long curved bodies project from the ear (Fig. 369, c
. Botany of the living plant. Botany. EU-MYCETES. ASCOMYCETES 437 wliich causes a disease on Rye-crops. The fungus attacks the ovaries of the Rye and other Grasses at the flowering period, spreading over them and causing the condition known as " ; This is the conidial stage, and it is spread from plant to plant by insects, which are attracted by a sugary secretion in which the conidia float (Fig. 369, rt, b ; also Fig. 341, p. 406). But the effect becomes more apparent as the crop ripens, for in place of the normal grains long curved bodies project from the ear (Fig. 369, c). These are the sclerotia of the fungus, which fall oft' at the time of ripening of the grain. They are the commercial source of suppK' of a useful drug. In this resting stage the winter is passed. In spring the sclerotia germinate, forming numerous pinhead-like •growths, which bear the flask-shaped peri- thecia characteristic of the large group of the Pyrenomycetes (Fig. 369, d, e). Finally in these the asci and thread-like ascospores are matured at about the time when the Grasses flower. It has been proved experi- mentally that hyphae from the germinating spores invade the Grass- flowers, causing the development of the conidial stage again. The. Fig, 370. Morchdla csculcnta, the fraitiii;^ body of the Morel. The convo- luted folds of surface are covered by the hyinenial layer, bearing' asci. (* nat, size.) (.\fter Stras- bui'ger.). 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and co. , limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
