. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. QHAP. II.—DIFFERENTIATION OF THE THALLUS.—FILAMENTOUS MVCELIA. 19 Careful investigations into the formation of the myceha of distinct species of non- parasitic Fungi are to be found especially in Brefeld's Untersuchungen iiber Schim- melpilze. The formation of clamp-conneetions described above may be taken as an example of a peculiarity which is characteristic of the larger groups. It occurs, as far as we at present know, almost exclusively in the Basidiomycetes and c
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. QHAP. II.—DIFFERENTIATION OF THE THALLUS.—FILAMENTOUS MVCELIA. 19 Careful investigations into the formation of the myceha of distinct species of non- parasitic Fungi are to be found especially in Brefeld's Untersuchungen iiber Schim- melpilze. The formation of clamp-conneetions described above may be taken as an example of a peculiarity which is characteristic of the larger groups. It occurs, as far as we at present know, almost exclusively in the Basidiomycetes and chiefly in the Agaricineae j it is found in the Tuberaceae, but apparently in no other Ascomycetes. Its occurrence in Peziza Sclerotiorum, as stated in my first edition, seems not to be confirmed in more. 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 on the right is sending a haustorium from the lobed 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 div
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