. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. —MORPHOLOGY AND COURSE OF DEVELOPMENT.—MYXOMFCETES. 433 these movements the branches of the plasmodia all change their previous distribution through the whole of the thickness of the body and creep to the periphery, where they form a net-work stretching only in the direction of the surface and formed of threads which become successively broader and meshes growing narrower and narrower (Fig. 188 a). The whole is covered on the outside by a thin layer of the hyaline pro
. Comparative morphology and biology of the fungi, mycetozoa and bacteria. Fungi -- Morphology; Bacteria -- Morphology. —MORPHOLOGY AND COURSE OF DEVELOPMENT.—MYXOMFCETES. 433 these movements the branches of the plasmodia all change their previous distribution through the whole of the thickness of the body and creep to the periphery, where they form a net-work stretching only in the direction of the surface and formed of threads which become successively broader and meshes growing narrower and narrower (Fig. 188 a). The whole is covered on the outside by a thin layer of the hyaline protoplasm which alone forms the whole of the inner portion of the body. When these processes are completed, the net-work of protoplasm breaks up simultaneously into numerous polyhedral portions of nearly uniform size (Fig. 188 b). They contain each a nucleus, become flattened from without inwards, and remain grouped in a simple layer which follows the surface like an epithelium. Then each of these proto- plasmatic bodies begins at once to grow convex towards the outside, and to lengthen out at right angles to the surface of the whole body into the shape of a sphere borne on a slender conical stalk (Fig. 188 b). A delicate membrane is formed at the. same time within which all the protoplasm passes through the stalk into the spherical expansion at the extremity. The latter then becomes in- vested all round with a some- what thicker membrane with an ellipsoid outline, and thus becomes a mature spore which is readily detached from the empty^hyaline stalk. The entire gelatinous sporophore under- goes no further changes, but in most cases soon dissolves and disappears. The other known ecto- sporous Myxomycete,Ceratium porioides, is distinguished from the species just described only by the yellow colour and by the shape of its sporophore, which resembles in form the hymenium of a Polyporus (see page 288). The development of the sporophores and receptacles as just described runs its
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