. La morphologie comparative et de la biologie des champignons, bactéries et mycetozoa . La morphologie des plantes ; Champignons ; myxomycètes ; bactériologie. Fig. S3. Phytophthora infestans, Mont, un sporange un couché dans l'eau modifient la division est complète, b s'échapper de l'essaim de lo- spores provenant du sporange. £-spores dans l'état de spores motiles, rf au repos et commence à germer. Magn. 390 fois. Fig. 54. Cladochytrium Iridis. Un repos- spore avec une membrane brun vu depuis le côté large, b la même une rotation de 90°, dans le centre est un grand corps gras. c-€ stades successifs de la germination d'une seule

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. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig. S3. Phytophthora infestans, Mont, a a sporangium lying in water alter the division is complete, b escape of the lo swarm- spores from the sporangium. £-spores in the motile state, rf spores at rest and beginning to germinate. Magn. 390 times. Fig. 54. Cladochytrium Iridis. a resting- spore with a brown membrane seen from the broad side, b the same rotated through 90°, in the centre is a large fatty spherical body. c-~€ successive stages of germination of a single specimen; the brown outer coat opens by a lid and the inner cell developes into 3 tubular receptacle of swarm-spores, d formation of the spores completed, e escape of the spores, ya single swarm-spore, a—e magn. 375 times, /"600 times. surrounds it and then becomes a swarm-spore as in Achlya. But the spores are not discharged through a single orifice in the sporangium, but each pierces through the nearest spot of the lateral wall of the sporangium, and even also through the empty meinbranes of the adjacent sister-spores. In the genus Saprolegnia a peculiar mode of proceeding is the rule. The spores are discharged from the orifice of the sporangium as ovoid motile bodies with the pointed extremity anterior in the swarming. This extremity is hyaline and two cilia project from its extreme point. The broad posterior portion is formed of granular protoplasm in which three small hyaline vacuoles lie immediately beneath the surface at laterally equidistant spots in the same transverse section. The spore comes to rest after a brief period of movement which does not last usually longer than a few minutes, assumes a spherical form and becomes invested with a thin cellulose-membrane ; but some time after, some hours or even days, it emerges again from the state of rest, the protoplasm escapes as in Achlya out of the membrane and is transformed into a bean-shaped swarm-spore. In

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