. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 208 MYCOLOGY Belonging to the genus Gymnoconia (Fig. 92) is the orange rust of raspberry and blackberry which is found throughout the United States and Canada. It is also widely distributed in Europe and Asia. The genus Phragmidium, which is confined entirely to plants of the rose family, is autcecious. Warts are formed on the teliospores by the contraction of an outer gelatinous layer which with a rigid middle lamina and the arrangement of the germ pores distinguishes Phrag-. Fig. 78.—
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 208 MYCOLOGY Belonging to the genus Gymnoconia (Fig. 92) is the orange rust of raspberry and blackberry which is found throughout the United States and Canada. It is also widely distributed in Europe and Asia. The genus Phragmidium, which is confined entirely to plants of the rose family, is autcecious. Warts are formed on the teliospores by the contraction of an outer gelatinous layer which with a rigid middle lamina and the arrangement of the germ pores distinguishes Phrag-. Fig. 78.—Teliospores of cedar apple showing germination with formation of basidia (promycelia) and basidiospores (sporidia). {After Reed, H. S., and Crabill C. H., Techn. Bull. 9, Va. Agric. Exper. Stal., May, 1915.) midium from neighboring genera. The teliospores are two- to several- celled by transverse septa. An important species is the Rust of Roses, Phragmidium subcorticium, which has a spindle-shaped teliospore with six to eight cells. Gymmsporangium is a genus of hetercecious rusts the £ecia of which occur on Rosacea (except one on Hydrangeac^ and one on Myri-. 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 Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
