. Botany of the living plant. Botany; Plants. BASIDIOMYCETES 441 A further point of importance is that in a nutritive liquid, like the foul water of the manure-heap, the spores formed on germination continue to multiply by budding, thus increasing the chances of infection (Fig. 339, d, e). The detached spores then conjugate and begin a bi-nucleate stage, which is able to penetrate the tissue of the seedling corn but not of the adult. The plant, once infected, grows on as though quite healthy till the flowering period. Then the parasite, the mycelium of which has followed its growth internally,
. Botany of the living plant. Botany; Plants. BASIDIOMYCETES 441 A further point of importance is that in a nutritive liquid, like the foul water of the manure-heap, the spores formed on germination continue to multiply by budding, thus increasing the chances of infection (Fig. 339, d, e). The detached spores then conjugate and begin a bi-nucleate stage, which is able to penetrate the tissue of the seedling corn but not of the adult. The plant, once infected, grows on as though quite healthy till the flowering period. Then the parasite, the mycelium of which has followed its growth internally, fastens on the ovary where nutritive material is concentrated, and diverts the food from the formation of the grain to the nutrition of a mass of its own spores. For prevention of the disease " dressing " of the seed- grain with disinfecting mixtures is practised. But equally important is to prevent the manure being contaminated by the spores from the smutted crop of a previous year. Hymenomycetales. The life-history of the Rust of Wheat has been described in some detail as giving an example of a Basidiomycete which still shows. Fig. 340. Fomes igniarius. Section through an old fructification, showing annual zones of growth, a = point of attachment upon the tree which is its host. The porous hymenium is directed downwards, (h nat. size.) (From Strasburger.) evidence of sexuality, both morphologically and physiologically; though it is altered from what was probably its normal and original course. In the rest of the Basidiomycetes such evidence is wanting. They may provisionally be held to be saprophytes and parasites which were descended from an ancestry with normal sexuality, but have advanced further in the elimination of their sexual process. In some species variation is ensured by the association of myeelia of different origin. The basidia (Fig. 328) are borne on fruit-bodies, which are often large and brightly coloured. They arise from a mycelium which acquires t
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