. Experiments with plants. Botany. PLAXTS WHICH CAl'SE BBC AT •iU.'l a mycelium which spreads rapidly through the Iiaf aud finally forms spores known as cluster-cup spr)rH> (or secidiospores). These spores, as their name implies, are arranged in clusters in cup- like cavities of the leaf (Fig. 228), which are produced by their growth. On exam- ining thin sections of the leaf carefully, we see that the cluster-cup spores are in long chains borne on short stalks (Fig. 229). On the upper surface of the leaf occur smaller cavities filled with smaller slender spore-bearing stalks; their function
. Experiments with plants. Botany. PLAXTS WHICH CAl'SE BBC AT •iU.'l a mycelium which spreads rapidly through the Iiaf aud finally forms spores known as cluster-cup spr)rH> (or secidiospores). These spores, as their name implies, are arranged in clusters in cup- like cavities of the leaf (Fig. 228), which are produced by their growth. On exam- ining thin sections of the leaf carefully, we see that the cluster-cup spores are in long chains borne on short stalks (Fig. 229). On the upper surface of the leaf occur smaller cavities filled with smaller slender spore-bearing stalks; their function is not understood. We see, then, that the Black Stem Rust of the Wheat occurs in three difiierent forms, at different times of the year—the uredospores in the summer, the teleutospores in the autumn, and the clus- ter-cup spores on Barberry in spring. Formerly, when it was not known that these were all forms of the same fungus, they were described as sepa- rate genera. The discov- ery that the Barberry had something to do with the Rust on Wheat was first. Autiimn spores ot the Black Stem Rust of Wheat pofiuc- Liigcoindia(c).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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