. Elements of botany. Botany. 226 ELEMENTS OF BOTANY spores appear, produced from the same mycelium. This growth is chiefly upon the stems and sheaths. 289. Cluster-Cup Stage. — Note with the naked eye and with a magnifying glass the a^jpearance of the cluster-cups upon the bar- berry leaf. Fresh specimens should be used if available. Note whether the leaf is changed in form or color in any part occupied by the fungus. Note the number of cups in a cluster, the position on the leaf (wliich surface?), the form and size, especially the height. Are they straight or curved? Describe the margin of t
. Elements of botany. Botany. 226 ELEMENTS OF BOTANY spores appear, produced from the same mycelium. This growth is chiefly upon the stems and sheaths. 289. Cluster-Cup Stage. — Note with the naked eye and with a magnifying glass the a^jpearance of the cluster-cups upon the bar- berry leaf. Fresh specimens should be used if available. Note whether the leaf is changed in form or color in any part occupied by the fungus. Note the number of cups in a cluster, the position on the leaf (wliich surface?), the form and size, especially the height. Are they straight or curved? Describe the margin of the cup, the color without, and the color of the contents. With a power of 200 diameters or more exandne some of the cells composing the cup and note the form, color, and nature of the surface. Draw. With the point of a needle or knife pick out a bit of the contents of the cup and examine as above. Note the characters as before and compare in detail with the cells of tlie cup. The cells within the cup are the spores. Can you tell how they are attached?. 161. A Cluster-Cup of Anemone Rust {Piiccinia fusm). (•< 120.) s, chains of spores: p. the covering or periiliiim of tlie cup; /^ liyplue, A thin section through the cup will sliow the mode of attachment and the relation of the spores to the cup. 290. Examination of Red and Black Rust. — Under tlie magnifying glass examine the eruptions of spores (suri) on the wheat plant, some of red spores and some of black spores. The red spores are faded in dried specimens. Note the approximate size and shape and any other peculiarities. Prepare slides of each kind of spores and see if. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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