. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. EUTHALLEPHYTA—EUMYCETES—RUSTS 227 appears that the uredo spores are not common the following spring. The investigations of the authors quoted here indicate that not in a single case was it possible to produce uredospores in the spring from those of the autumn. H. L. BoUey, of Fargo, N. D., remarks in regard to several cluster cup fungi which occur on members of the Borage family: Stveral aecidia of unknown life history have been stud
. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. EUTHALLEPHYTA—EUMYCETES—RUSTS 227 appears that the uredo spores are not common the following spring. The investigations of the authors quoted here indicate that not in a single case was it possible to produce uredospores in the spring from those of the autumn. H. L. BoUey, of Fargo, N. D., remarks in regard to several cluster cup fungi which occur on members of the Borage family: Stveral aecidia of unknown life history have been studied with reference to their relations to the red rust of Puccinia rubigo-vera, many infection tests being made upon young wheat and oat plants, all with negative results. In this region Onosomodium Carotinianum bears very profusely an aecidium, which, because of its date of appearance, was worthy of suspicion; but tests enough were made to remove this notion. P. rubigo-vera as well as the common grass rust, is very destructive in England and Australia; but according to Wolf, is not so common in Germany. A few years ago Professor Arthur investigated the subject of wheat rust in Indiana and found that this species was much more destructive to wheat in that state than common grass rust. The same year, 1889, the writer found that this rust was much more common on wheat in Iowa. Carleton says he is confident that the orange-leaf rust (P. rubigo-vera) does very little if any damage to the grain in this country; that in all cases of serious damage to the grain by rust the black-stem rust (P. graminis) is the real cause. In 1907, the leaf rust was very destructive to spring wheat in Iowa. Pi'ccinia glumarum, Schmidt Aecidium unknown; the uredosori occur along the veins. The diseased leaf is frequently of irregular contour, color orange yellow, spores spherical, or short, elliptical, spiny. Teleutosori, grayish, covered by the epidermis on the stalks and leaves, less frequently on t
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