. 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. 38 British Uredineee and Ustilaginecs. to form elevated ridges. As an accidental variety, one sometimes sees a few bicellular spores in the true Uro- myces spore-bed; this has been ob- served with Uromyces trifolii on Vicia. The teleutospores of Puccinia are compound. They consist of two dis- tinct spores borne on one pedicel. The dilated upper extremity of th
. 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. 38 British Uredineee and Ustilaginecs. to form elevated ridges. As an accidental variety, one sometimes sees a few bicellular spores in the true Uro- myces spore-bed; this has been ob- served with Uromyces trifolii on Vicia. The teleutospores of Puccinia are compound. They consist of two dis- tinct spores borne on one pedicel. The dilated upper extremity of the hypha, which is destined to become a Puccinia spore, soon assumes a fusiform shape, and is uniformly filled with granular protoplasm, while the lower part of the hypha contains only a hyaline or watery material (Plate III. Fig. 18). Soon a delicate transverse septum appears near Fig. 2.âTeieutospore the middle of the swollen part, dividing of Uromyces fabce germi- . nating, showing the germ- it transverscly mto two nearly equal canal through which the "^ â ^ tr"S"and tfi'^devJfop" compartmcnts. The spore now becomes "po-°Lm\CeToll' invested by a stouter membrane (Fig. wards. (Tuiasne.) ^^^^ ^j^j^j^ gradually iucrcascs in thick- ness so that the body now can be seen to consist of two distinct accumulations of protoplasm. As the thickening of the outer membrane goes on it becomes darker. This thickening is most marked at the apex of the upper com- partment. The granular protoplasm at first usually shows two or three vacuoles (Fig. 20), but these become reduced in number, so that in the mature spore only one is observ- able (Fig. 21). How this vacuole is formed is not alto- gether clear, but it probably is produced by the protoplasm of each compartment accumulating more towards the walls of the cell than elsewhere. Each compartment, then, con- sists of a thick outer membrane, lined by a thin one (the endospore) which encloses the protoplasm and its
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfungi, booksubjectsmu
