. Essentials of botany. Botany; Botany. 256 ESSENTIALS OF BOTANY one is known as the cluster-cup stage and the others as red . rust and llach rust, according to the usual approximate color of the spores. The rust called Puccinia graminis, growing on wheat, has its cluster-cup stage on the leaves of barberry in June. The spores from the cluster-cups are carried by the wind to the wheat, where they germi- nate and in a few days produce the red rust. A little later the black spores appear, produced by the same myce- lium. This growth is chiefly upon the stems and sheaths.. Fig. 181. A Cluster-Cup
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. Essentials of botany. Botany; Botany. 256 ESSENTIALS OF BOTANY one is known as the cluster-cup stage and the others as red . rust and llach rust, according to the usual approximate color of the spores. The rust called Puccinia graminis, growing on wheat, has its cluster-cup stage on the leaves of barberry in June. The spores from the cluster-cups are carried by the wind to the wheat, where they germi- nate and in a few days produce the red rust. A little later the black spores appear, produced by the same myce- lium. This growth is chiefly upon the stems and sheaths.. Fig. 181. A Cluster-Cup of Anemone Rust (PMCcmia/usco). (xl20.) s, chains of sporfes; p] the covering or peridium of the cup; h, hyphse. 329. Cluster-Cup"'Stage, Gross Structure. — Procure if possible fresh specimens of infected barberry leaves. If these are not available, dried leaves soaked for a short time in water or (still better) leaves preserved in alcohol may be used. With the magnifying glass note : (a) The occurrence of the cups (cecidia ; singular mcidiuni). Are they on the upper or lower surface of the leaf ? (6) The number of cups in a cluster, (c) The form, size, and color of the cups. 330. Cluster-Cup Stage, Minute Structure. — Cut a thin section of a leaf through a cluster of cups. This can best be done by holding the portion of leaf to be sectioned between two pieces of elder pith.^ 1 If desired, prepared slides can be bought of the dealers.. 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 work.. Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn