. La morphologie comparative et de la biologie des champignons, bactéries et mycetozoa . La morphologie des plantes ; Champignons ; myxomycètes ; bactériologie. CHAP. II.-différenciation du thalle.-gomme les sporophores. 53. Le FLC. 22. Peziza [Scleratinia ScUrotiorum, Fuckel), Lib. Sclerotium avec emerge* ing les sporophores de différentes ag^es. Nat. taille. sont dans l'apex de la structure et forme son point de croissance, dans lequel la croissance en longueur continue, même s'il meurt dans les pièces ci-dessous comme ces devenir successivement plus loin d'elle et les cellules des hyphes ont augmenté plus long et plus épais. L'arrangement en parallèle de la

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. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAP. II.—DIFFERENTIATION OF THALLUS.—COMPOUND SPOROPHORES. 53. Flc. 22. Peziza [Scleratinia, Fuckel) ScUrotiorum, Lib. Sclerotium with emerge* ing sporophores of different ag^es. Nat. size. are in the apex of the structure and form its growing point, in which growth in length continues, while it dies out in the parts below it as these become successively further removed from it and the cells of the hyphae have grown longer and thicker. The parallel arrangement of the hyphae is not everywhere maintained; firstly, a number of short hyphal branches bend round obliquely upwards and outwards close below the apex, and terminate in the free lateral surface, where they form a cortical layer to the compound sporophore; and secondly, in the first stages of the develop- ment, when the sporophore is scarcely visible to the naked eye, the hyphae surrounding the longitudinal axis are somewhat more loosely united together than in the periphery and have their extremi- ties slightly curved towards the axis. In this state the primordial sporophore grows to a certain length by continued apical growth in a straight line. Then the growth in length of the axile hyphae is retarded while that of the peripheral hyphae advances rapidly. In this way a narrow canal, which can only be seen under the microscope, is formed in the apex of the cylindrical sporophore with its upper margin bounded by the slightly incurved extremities of the hyphae. And while growth constantly proceeds in the direc- tion of this margin, successive formations of new and similar elements take place in it, and behind it in- tercalary additions (which however gradually cease to appear), together with the first formation and development of the hymenium and other parts: thus the cylindrical body gradually assumes the form of the stalked funnel. The final growth in thickness of the stipe, which

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