. 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. 24 British Uredinece and Ustilaginecs. shining as a small yellow tubercle. The epidermis becomes ruptured by the pressure of the young growing secidium from below ; and, either before or soon afterwards, the pseudo- peridium itself gives way at its summit, exposing the ripe secidiospores. The ruptured peridium now becomes re- curved, and, as seen from above, t
. 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. 24 British Uredinece and Ustilaginecs. shining as a small yellow tubercle. The epidermis becomes ruptured by the pressure of the young growing secidium from below ; and, either before or soon afterwards, the pseudo- peridium itself gives way at its summit, exposing the ripe secidiospores. The ruptured peridium now becomes re- curved, and, as seen from above, the aecidium is cup-shaped. The white peridium contrasts with the golden yellow of the spores very strikingly. The peridial cell-series still show their linear origin by separating into teeth, the attach- ment being stronger from above downwards than laterally. This recurved, toothed mar- gin of the peridium is highly characteristic of the aecidia. The aecidium and its peridium consist at this stage of a few fully developed spores and cells above, and of a vast number of undeveloped spores below. As these latter mature they push the old ripe spores upwards and outwards, and they are car- ried away by air currents, rain, and by any cause that shakes the host-plant. If the affected plant be grown indoors or continually covered by a bell glass, so as to prevent any injury to the aecidium itself or any agitation of the host-plant, the aecidium elongates itself in a cylin- drical manner. This was strikingly shown in a specimen of ^c. berberidis which I cultivated and exhibited at the Biological Laboratory of the International Health Exhi- bition, 1884, in which the peridia developed themselves into long curved cylindrical bodies. The above illustra-. Fig. I.—Mcidium berberidis. A, with normal pseudoperidia; B, with abnormally elongated pseudoperidia. Figured by Mr. WorthiDgton G. Smith from an experimental culture of the author's in the Biological Laboratory of the International He
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfungi, booksubjectsmu
