. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 8. Section of leaf of Carex paludosa, with a sorus of uredospores of P. Garicis; a, upper epidermis; 6, a vascular bundle. Most of the pedicels have lost their spores, x ISO. likewise binucleate. After a few days this mycelium begins to form the third kind of spore—the uredospore. A knot of hyphas is formed just beneath the epidermis; some of the branches turn upwards and form a regular layer parallel to the surface—the spore- bed (Fig. 8). The upper rounded cell of each hypha is divided into two daughter-
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. Fig. 8. Section of leaf of Carex paludosa, with a sorus of uredospores of P. Garicis; a, upper epidermis; 6, a vascular bundle. Most of the pedicels have lost their spores, x ISO. likewise binucleate. After a few days this mycelium begins to form the third kind of spore—the uredospore. A knot of hyphas is formed just beneath the epidermis; some of the branches turn upwards and form a regular layer parallel to the surface—the spore- bed (Fig. 8). The upper rounded cell of each hypha is divided into two daughter-cells, the lower of which is developed into a stalk, the upper becomes the uredospore (Fig. 9). The spore is oval or roundish; when mature it is enclosed in a double cell-wall, the outside being cutinised and provided with spine-like projections, some- what like those of the secidiospore, only more pointed. In the inner layers of the exospore there are usually three (rarely. Fig. 9. P. Garicis. De- veloping uredospores (1, 2, 3, 4, show stages of growth; 5 is a pe- dicel from which the spore has vanished). 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 Grove, W. B. (William Bywater), 1848-1938. Cambridge, University Press
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