. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 3i6 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. falls away (Vittadini). In some, perhaps in most species, as for instance in Bovista plumbea and Lycoperdon perlatum, according to Tulasne and Vittadini, the dis- organisation affects the whole of the outer peridium and it becomes changed into a slimy mass, which turns as it dries into a brittle and almost structureless mem- brane. The structure of the peridium is more complicated in Geaster. G. hygrometricus is up to t
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 3i6 DIVISION II.—COURSE OF DEVELOPMENT OF FUNGI. falls away (Vittadini). In some, perhaps in most species, as for instance in Bovista plumbea and Lycoperdon perlatum, according to Tulasne and Vittadini, the dis- organisation affects the whole of the outer peridium and it becomes changed into a slimy mass, which turns as it dries into a brittle and almost structureless mem- brane. The structure of the peridium is more complicated in Geaster. G. hygrometricus is up to the period of perfect maturity a roundish body, which may be of the size of a hazel-nut and remains beneath the surface of the ground (Fig. 146). Six layers may be distinguished in the peridium in a vertical longitudinal section a short time before the compound sporophore is mature. The outermost layer is of a brownish colour, flaky and fibrous, and is continued on one side into the mycelial strands which spread through the soil and on the other passes into the second layer; a thick stout brown membrane entirely covering the compound sporophore. This is followed towards the inside by a white layer, which is more largely developed at the base of the compound sporophore than elsewhere and is immediately continuous at that spot with the inner peridium and the gleba. Both of these last-mentioned layers are formed of stout closely-woven hyphae running in the direction of the surface, and may be combined under the name of layer. The inner of the two is lined on the inside by the collenchyma-layer (Fig. 146 c), except where its basal portion passes into the gleba. This layer is cartilaginously gelatinous and consists of hyphal branches of uniform height connected together without interstices, which are placed palisade-like vertically to the surface and are bent as they spring from the hyphae of the fibrillose layer. The strongly thickened stratified walls of the cells
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