. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 66 DIVISION I.—GENERAL MORPHOLOGY. In the simple successive serial or concatenate forms the abjunction is repeated beneath the insertion of each propagative cell in the same direction and in the same form as in the case of the first cell. If the line of abjunction in that case was broad and transverse, the extremity of the sporophore beneath the youngest spore elongates to a definite extent and abjunction again takes place by formation of a new trans- verse wall; if t
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. 66 DIVISION I.—GENERAL MORPHOLOGY. In the simple successive serial or concatenate forms the abjunction is repeated beneath the insertion of each propagative cell in the same direction and in the same form as in the case of the first cell. If the line of abjunction in that case was broad and transverse, the extremity of the sporophore beneath the youngest spore elongates to a definite extent and abjunction again takes place by formation of a new trans- verse wall; if the first sprout which becomes a spore has a constricted insertion, then after each abjunction a similar sprout with constricted base is developed beneath it from the persistent end of the sporophore and in turn undergoes abjunction. In this way a chain of similar segments is produced, in which the cells are younger in proportion as they are nearer to the extremity of the sporophore from which they are formed. The number of cells in a chain ^^^"^_ may be considerable, 20-30 or more. Examples are to be found in the gonidia of most of the Erysipheae, Cystopus, Penicillium, Cordyceps, and the Aecidieae, in the uredospores of Coleosporium, Chrysomyxa, and many others (Fig. 33). Branched serial or concatenate forms arise when one or more outgrowths stand- p ' Q ^^^T^ '"8^ ^''^^ ^y ^^^'^ °^ ^^ ^P®^ °^ ^ filiform «* V \ \ sporophore are abjointed, and then by repeated abjunctions produce a structure not unlike one of the Sprouting Fungi (Fig. 3). The first sprout-cell puts out one new protuberance from the apex which is remote from the sporophore, and this new cell and each succeeding one can do the same; a row of cells is thus formed in which the members are succes- sively younger as the apex is approached. Each of them can then form one or more lateral sprouts below its apex which adjoins the cell next above it, and these new cells and their progeny are similar to the
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