. Introduction à l'étude des champignons ; leur organography, classification, et la distribution, à l'usage des collectionneurs. Les champignons. 42 INTRODUCTION À L'ÉTUDE DES CHAMPIGNONS. habituellement présente, mélangée à de la baside mais plutôt grandes, et les cellules stériles sont plus petits et presque de la nature de, ou analogues à des paraphyses, (Fig. 22). De Seynes ce qui concerne tous les trois formes que des modifications du même organe, c.-à-d. la baside, dont le sont les porteuses de spores basides fertile, l'sont hypertrophiés, les basides cystides et les cellules stériles les basides atrophiés. Toutes ces cellules sont des suites et les résiliations de

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. Introduction to the study of fungi; their organography, classification, and distribution, for the use of collectors. Fungi. 42 INTRODUCTION TO THE STUDY OF FUNGI. usually present, mixed with the basidia but rather larger, and the sterile cells are smaller and almost of the nature of, or analogous to, paraphyses (Fig. 22). De Seynes regards all three forms as modifications of the same organ, i.e. the basidia, of which the spore-bearing are the fertile basidia, the cystidia are hypertrophied basidia, and the sterile cells atrophied basidia. All these cells are continuations and terminations of the tissues of the receptacle, sometimes with three or four subspherical cells intervening. The basidia are elongated clavate cells, or sporophores, filled with a granular fluid, surmounted by four short slender tubes, or spicules, each of which expands at the apex and becomes a spore; into which Fia 22.-Basidia (6) and cystidia the contents of the basidium pass, (c) of Agancuq; (a) paraphyses. . r leaving the basidium empty, so that when its duties are completed it collapses and shrivels, then falls away. The spores thus formed by budding or gemmation, as far as known at present, are asexual and only gemmae. Many efforts have been made to prove them otherwise, but none of these have been con- firmed. The spores themselves are unicellular (except in the Tremellini), and may be colourless or coloured. Modifications seem to take place in the cystidia, in different genera, inde- pendent of any difference in size. In the genus Peniophora they evidently become encrusted with lime and granular, so'as to present quite a distinct appearance; in this condition they have been called " metuloids." In Hymenochaete and some species of Fomes the normal cystidia are replaced by rigid coloured setae, which may be modifications of cystidia. Corda regarded these peculiar cells as representatives of male organs, and called them antheridia; and a similar interpretation has been given to

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• bookauthorcookemcm
• bookcentury1800
• bookdecade1890
• bookyear1895