. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. 230 MANUAL OF POISONOUS PLANTS known as sporidia. Acording to Dr. J. C. Arthur, it is undoubtedly connected with an aecidium on Oxalis corniculata. Distribution and hosts. Common wherever corn is cultivated and according or Carelton, also upon teosinte.. Fig. 66. Corn rust (Puccinia Sorghi) on corn. Winter spores. Uromyces. Link. Clover Rust Aecidiospores in cup-like bodies with an evident pseudoperidium; uredo- sori powdery; uredoso

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. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. 230 MANUAL OF POISONOUS PLANTS known as sporidia. Acording to Dr. J. C. Arthur, it is undoubtedly connected with an aecidium on Oxalis corniculata. Distribution and hosts. Common wherever corn is cultivated and according or Carelton, also upon teosinte.. Fig. 66. Corn rust (Puccinia Sorghi) on corn. Winter spores. Uromyces. Link. Clover Rust Aecidiospores in cup-like bodies with an evident pseudoperidium; uredo- sori powdery; uredosoores 1-celled with several evident germ pores; teleutosori powdery; teleutospores 1-celled, separate, pedicellate, apex with a single germ pore; sporidia flattened on one side. About 250 species widely distributed. Many of the species produce serious diseases of cultivated plants, as Uromyces pisi upon the pea, the alfalfa rust, ([/. striatus, ) and the bean rust, ( U. ap- pendiculatus (Pers. Lev.) There are many other species found upon our wild plants. Some of these, when they occur upon forage plants, may cause mycotic stomatitis. Uromyces Trifolii. (Hedw.) Lev. Aecidia in circular areas of pale colored spots; pseudoperidia short, cylin- drical, fiattish; edges, whitish, torn; spores sub-globose or irregular, finely roughened, pale orange; 14-23 *» in diameter; uredosori pale brown, round, scattered, surrounded by the torn epidermis; spores round or ovate, roughened; 20-26x18-20 M with 3 or 4 germ pores; color brown; teleutosori small round almost black; long covered by the epidermis; spores globose, elliptical or sub- pyriform occasionally with wart-like swellings on the summit 15-20x22-30 p; small dark brown in color; pedicels long. Distribution. Widely distributed upon various clovers, , especially red clover and the white clover. So abundant is this fungus at times that the plants are covered with the brown dusty material. Miss Howell reports it as very severe in the stat