. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAP. II.—DIFFERENTIATION OF THALLUS.—COMPOUND SPOROPHORES. 55 the apex of the pileus soon cease to lengthen; they become the tissue of the middle of the pileus, while as the margin advances the hyphae which run into it send out numerous straight or curved branches upwards and outwards, which in their turn soon cease to elongate and form the general tissue of the pileus (Fig. 24 b). Closely crowded branches from the under surface of the layer which runs into the margi
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CHAP. II.—DIFFERENTIATION OF THALLUS.—COMPOUND SPOROPHORES. 55 the apex of the pileus soon cease to lengthen; they become the tissue of the middle of the pileus, while as the margin advances the hyphae which run into it send out numerous straight or curved branches upwards and outwards, which in their turn soon cease to elongate and form the general tissue of the pileus (Fig. 24 b). Closely crowded branches from the under surface of the layer which runs into the margin grow at the same time and in the same centrifugal succession from a curved base perpendicular to the under surface of the pileus; these are the beginnings of the tissue that bears the hymenium and of the hymenium itself. They are at first of uniform length, and the surface of the hymenium is smooth at first, as Hoffmann rightly affirms in opposition to a former incorrect statement of mine, though it only continues so for a short time. The elongation of the hymenial hyphae which grow vertically downwards takes place in alternating radial bands in varying degree. In some it continues longer, and they project beyond the smooth surface as the trama of the lamellae, on which the hymenial elements arise in the position already described, advancing from the base toward the free edge. The hyphal extremities cease to elongate at an earlier period in the intervals between the lamellae, and become directly elements of the hymenium. During this growth by terminal and marginal formation of new constituents, the parts at a distance from the growing point or mar- gin enlarge by expansion of their cells, and the tis- sue which is at first uni- form is differentiated at the same time into the several layers of the ma- ture sporophore. It is readily observed that this process of expansion also advances in the stipe from below upwards, and in the pileus from the centre to the margin. To thi
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