. A monograph of the British Uredineae and Ustilagineae, with an account of their biology including the methods of observing the germination of their spores and of their experimental culture. Smut fungi; Rust fungi; Smut diseases; Fungi. 88 British Uredinece and Ustilaginea. however short it may be, there is always one septum developed near its upper end. The tubercles above men- tioned increase rapidly in length, and become the primary spores (Plate VI. Fig. 7). They are filiform bodies, curved in various ways, and measure from 80 to loo^uin length ; in number they vary from four to twelve or
. A monograph of the British Uredineae and Ustilagineae, with an account of their biology including the methods of observing the germination of their spores and of their experimental culture. Smut fungi; Rust fungi; Smut diseases; Fungi. 88 British Uredinece and Ustilaginea. however short it may be, there is always one septum developed near its upper end. The tubercles above men- tioned increase rapidly in length, and become the primary spores (Plate VI. Fig. 7). They are filiform bodies, curved in various ways, and measure from 80 to loo^uin length ; in number they vary from four to twelve or more, according to the size of the spores from which they are developed. When all the protoplasm from the promycelium has been absorbed into these primary spores, they become cut off from it by septa at their attached ends. If the prorpycelium be so situated that it cannot reach the air, no primary spores are produced. Shortly after their maturity these primary spores conjugate (Plate VI. Fig. 8), or become united by trans'^erse bridges, usually in pairs. The primary spore is possibly a Fig. 7.—Germinating teleutosnore of wind-rarriprl rp hiif as in Tilletiit tritici, producing a cluster of WlllU-Cdrnea bporC, DUt, aS in primary promycelial spores. A conjugated „-,f;i;-;„i -,,,1+.,, -^r. 4-V. *- pair of promycelial spores producing two artinciai cuitures tney are not secondary spores—an unusual circumstance j j. • ^ i r (ss). A secondary promycelial spore which CXpOSed tO tnlS lOrCe, they irC- has produced a tertiary (^0- (Tulasne.) quently germinate in situ. This they do by a repetition of the oft-described process of protoplasmic migration, with septation of the emptied parts; the protrusion of a bud-like process into which the protoplasm is emptied, and which becomes a secondary spore. The end of the promycelium, after the primary spores' have fallen off, remains tuberculated, showing the points of their attachment. The conjugation of two primary spores cannot
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfungi, booksubjectsmu
