Cette étude explore la morphologie comparative des champignons, des mycétozoaires et des bactéries, en se concentrant sur leur structure biologique et leurs modes de vie. La recherche examine diverses formes de champignons et leurs interactions avec d'autres micro-organismes en biologie végétale et environnementale.
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. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 404 DIVISION III.—MODE OF LIFE OF THE FUNGI. meduUare). Both layers belong to the hyphal system, their constituents are ramifi- cations of the same hyphae. The cells of the Alga are in almost all cases inserted where the medulla and the rind meet. Together they form a green zone of varying size projecting into the medullary tissue to a different depth at different points, everywhere traversed by single hyphae of the medulla running to the rind, and in some places showing larger interruptions. This is the a/gal layer or algal zone which is commonly termed the third tissue-layer. But single algal cells or groups of cells are often found scattered through the medulla, as in Solorina and Placodium, or the whole mass of algal cells is distributed with tolerable uniformity through the medulla, as in Bryopogon. Sundry modifications of this type and small deviations from it occur in different species and groups of species. The following are the most important ones:— Some fruticose thalli, especially if cylindrical in form, are covered all round with a uniform rind, as in Usnea (Fig. 171), Bryopogon, Roccella, Sphaerophoron and others. In many fruticose forms with a flat thallus (species of Evemia and Cetraria) and in most foliaoeous forms the rind of the upper surface which is towards the light is different from that of the lower surface (Figs. 172, 173); in Anaptychia, Peltigera, Solorina and most of the foliaoeous portions of the thallus in the Cladonieae the upper side only has the rind up to the margin, the lower surface has no rind. When there is this difference in the two surfaces, the algal zone apart from the scattered cells only appears on the side towards the light. Even in the almost cylindrical thallus of Sphaero- phoron with a uniform rind all round it, it is often more strongly developed on the side towards the light than on the l
