. Minnesota plant diseases. Plant diseases. 390 Minnesota Plant Diseases. remain in the cells of the host. The cluster-cups are found on the leaves of some coniferous tree. Spruces in the neighbor- hood of affected cow- berry plants often show an abundance of cluster cups and are usually most seriously attacked in the lower branches. It has not been proven in our American plants that these two stages are con- nected, but there seems to be considerable proba- bility that such is the case. Rust of a n emon e (Puccinia fusca Relh.). Anemone, Thalictrum and allied genera are sub- ject to the attac
. Minnesota plant diseases. Plant diseases. 390 Minnesota Plant Diseases. remain in the cells of the host. The cluster-cups are found on the leaves of some coniferous tree. Spruces in the neighbor- hood of affected cow- berry plants often show an abundance of cluster cups and are usually most seriously attacked in the lower branches. It has not been proven in our American plants that these two stages are con- nected, but there seems to be considerable proba- bility that such is the case. Rust of a n emon e (Puccinia fusca Relh.). Anemone, Thalictrum and allied genera are sub- ject to the attack of anemone rust. In this rust only the winter spores are produced. The af- fected plants are consid- e r a b 1 y deformed. The leaf stalks are longer and the leaf blades are thick- ened. The spore groups are found on the lower surface of the leaves. The winter spores of the anemone rust pass the winter in a resting condition on the dead leaves of the host and germinate in the spring. Rust of wild sarsaparilla (Triphragmiuvi davellosum Berk.). Although found only rarely in some places, this rust is very com- mon in others. It is particularly abundant in the northern part of the state, but is exceedingly rare or entirely wanting in the middle and southern parts. It forms blackish, winter-spore groups on the under surface of the leaf. These groups are almost smut-like in their appearance. The spores are com-. FlG. 207.—The stem rust of cowberry (a plant of the blueberry group). The fungus spores are formed in the skin cells of the host, several in each cell; they have germinated sending out short, divided threads, each division of which produces a short-stalked basidiospore. Highly magnified. After 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 Freeman, Edward Monroe, 1875-. Saint Paul, Minn.
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