. L'histoire naturelle des plantes, leurs formes, la croissance, la reproduction et la distribution ;. La botanique. Par DISPEESAL MÉCANISMES EXPULSIVE. Trates 825 dans le corps-cavité, et là, elle se divise de façon répétée, formant de nombreuses cellules dans tout le corps. La mouche infectée, écœurant sous l'influence préjudiciable du champignon et presque au moment de la mort, cherche pour un peu de silence pour mourir. Il choisit souvent pour son dernier lieu de repos un carreau de fenêtre, dans ce cas, il est possible de mener une enquête approfondie sur la poursuite du développement du champignon, après la mort de la mouche les cellules rondes de la

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. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. DISPEESAL BY EXPULSIVE MECHANISMS. 825 trates into the body-cavity, and there it divides up repeatedly, forming numerous cells throughout the body. The infected fly, sickening under the injurious influence of the Fungus and almost at the point of death, seeks for some quiet spot in which to die. It frequently chooses for its last resting-place a window pane, in which case it is possible to thoroughly investigate the further development of the Fungus, After the death of the fly the round cells of the Empusa, hitherto hidden in the body-cavity, grow out into long tubes which pierce the skin of the fly's corpse and appear as short club-shaped structures on the surface. A single egg-shaped conidium. Fig. 456.—Distribution of spores by expulsive mechanisms. i Pilobolus cHstallinus before the sporaQgium breaks away. 2 xhe same at the moment when the sporangium is thrown off. 3 Sporangium of Nepkrodium Filix-mas closed. * and ^ The same in the act of splitting and scattering the spores. 6 Sphcerobolus stellatus at the moment when the balls filled with spores are thrown off. '^ Peziza aurantia. 8 Longi- tudinal section through this Peziza. The spores are escaping from two of the asci. All the figures magnified is then cut off" from each club-like end of the tube, and this is thrown off" in exactly the same way as the sporangium of Pilobolus (cf. fig! 383'', p. 672). Here, too, a place is formed for the splitting, and here again the mucilaginous contents are thrown off simultaneously with the conidium by the sudden contraction of the club- shaped end of the tube, and the conidium is thus always surrounded by a gelatinous adhesive mass (fig. 383 *). The distance of the projection may be as much as 2-3 cm., which, considering the extraordinary minuteness of the conidia, is proof of great power. The dead fly then appears to be surrounded by a veritable halo of detached con

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• bookcentury1800
• bookdecade1890
• booksubjectbotany
• bookyear1895