. Plant studies; an elementary botany. Botany. 282 PLANT STUDIES "; This mycelium on the barberry, bearing cluster-cups, was thought to be a distinct plant, and was called JEcidium. The name now is applied to the cluster-cups, which are called mcidia, and the conidia-like spores which they produce are known as cecidiospores. It is the mcidia which give name to the group, and iEcidiomycetes are those Fungi in whose life history ascidia or cluster-cups appear. The aecidiospores are scattered by the wind, fall upon the spring wheat, germinate, and develop again the myce- li
. Plant studies; an elementary botany. Botany. 282 PLANT STUDIES "; This mycelium on the barberry, bearing cluster-cups, was thought to be a distinct plant, and was called JEcidium. The name now is applied to the cluster-cups, which are called mcidia, and the conidia-like spores which they produce are known as cecidiospores. It is the mcidia which give name to the group, and iEcidiomycetes are those Fungi in whose life history ascidia or cluster-cups appear. The aecidiospores are scattered by the wind, fall upon the spring wheat, germinate, and develop again the myce- lium which produces the rust on the wheat, and so the life cycle is com- pleted. There are thus at least three distinct stages in the life history of wheat rust. Begin- ning with the growing season they are as fol- lows : (1) The phase bear- ing the sporidia, which is not parasitic ; (2) the secidium phase, parasitic on the barberry; (3) the uredo-teleutospore phase, para- sitic on the wheat. In this life cycle at least four kinds of asexual spores. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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