. La morphologie comparative et de la biologie des champignons, bactéries et mycetozoa . La morphologie des plantes ; Champignons ; myxomycètes ; bactériologie. Fig.6- adJaAbPodosphaeraCasla^£ ei, Lév. « EpidennalceUsof^» yiyr ?pour""".^A'un abranchedmycelialhypha^« MOT ; s'approche plus de surface et^ liaustorium tias a envoyé un dans l'une des cellules ttie (surface). ^ section verticale à travers les cellules de l'épiderme avec l'hyphe mycélien et un haustorium qui a pénétré dans une cellule, c'une spore (gonidium VmbeUiferarum d'Erysiphe) met de l'avant-tuijes germe sur l'épiderme de Anthrisctis sylvtstris. La plus petite gemi.tube sur la droite est sen

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. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. Fig.6- adJaAbPodosphaeraCasla£^ei, Lev. «epidennalceUsof^'?to»yiyr««.^A'a^«MOT; abranchedmycelialhypha is creeping over tlie surface and tias sent a liaustorium into one of ttie cells (surface view). ^ vertical section through epidermal cells with mycelial hypha and a haustorium which has penetrated into a cell, c a spore (gonidium) of Erysiphe VmbeUiferarum putting forth germ-tuijes on the epidermis of Anthrisctis sylvtstris. The smaller gemi.tube on the right is sending a haustorium from the lobed attachment.disk mto an epidermal celL a and b magn. 600, c 375 times. recent times. It is at present uncertain whether it is a feature of all the Basidiomycetes or only of all the Agaricineae, and the more so as according to Brefeld it is frequent in one species of the genus Coprinus, but comparatively rare in all the rest. A greater number of distinctly marked characters have been observed in the mycelia of parasitic Fungi, especially the Erysipheae, Peronosporeae, Uredineae, and Ustilagineae than in other forms, and they have been observed for a longer time. Such characters occur chiefly in the formation of the haustoria of many species and groups of species in those divisions ; the following are examples of them. The mycelial filaments of the Erysipheae (Figs. 6, 7) are furnished with transverse walls, and their numerous but distant branches spread themselves over the epidermis of phanerogamous plants, being generally closely applied to it, but at the same time easily separable from it. At certain circumscribed spots, how- ever, they are firmly attached to the substratum, and in these spots they are provided with a haustorium which, springing as a branch from a cell of the mycelium in the form of a very delicate tube, pierces the outer wall of the nearest cell of the epidermis and enters its cavity; there it enlarges into an ellipsoid o

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