. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. i88 DIVISION II.—COUSSE OF DEVELOPMENT OF FUNOI. latter are placed perpendicularly to the surface of the hymenium, and terminate at a uniform height on this surface, being crowded together in great numbers and usually giving the hymenial layer its characteristic tint from the colouring of their walls, or contents: not infrequendy, especially in the hymenia of the Lichen-fungi, they are united laterally and without gaps by the gelatinously thickened walls, so that thei
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. i88 DIVISION II.—COUSSE OF DEVELOPMENT OF FUNOI. latter are placed perpendicularly to the surface of the hymenium, and terminate at a uniform height on this surface, being crowded together in great numbers and usually giving the hymenial layer its characteristic tint from the colouring of their walls, or contents: not infrequendy, especially in the hymenia of the Lichen-fungi, they are united laterally and without gaps by the gelatinously thickened walls, so that their lumina appear to be set in a homogeneous structureless jelly. The paraphyses spring by their inner or lower extremities, that is, those turned away from the outer surface as branches from a dense hyphal tissue beneath the hymenium, the subhymenial layer or hypothecium, which is then continued further downwards into the more or less largely developed receptaculum or stipe of the apothecium, or at least into an outer envelope, the excipulum, which belongs to it, though it is not greatly developed. The paraphyses, together with the elements of the hypothecium which produce and bear them and the receptaculum or excipulum, belong to the envelope-apparatus of the apothecium. But the ascogenous hyphae take their course in the hypothecium, being interwoven with the ele- ments of the envelope; they grow up in the commencing apothecium from points of origin, which will be described more exactly in section LXIII, in the direction of the hymenial layer, and afterwards spread themselves out near the under surface of the disk with copious branching which follows the progressive growth of the whole . apothecium, and thrust the extremities of their branches of the last order successively in between the paraphyses to form the asci. In many of the species belonging to this division the ascogenous hyphae can scarcely be distinguished from the elements of the envelope which surround them by an
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