. Agricultural botany, theoretical and practical. Botany, Economic; Botany. 732 FUNGI produce the fungus there. However, if they are carried by the wind or other means to the leaves of wheat plants, each aecidiospore produces one or two germ-tubes which enter through the stomata of the wheat leaves and give rise to a mycelium from which uredospores are produced. We thus observe that during its life-cycle the fungus bears three different forms of chlamydospores, namely, secidiospores on the barberry in spring, uredospores on wheat in summer, and teleutospores in late summer also on wheat. The t
. Agricultural botany, theoretical and practical. Botany, Economic; Botany. 732 FUNGI produce the fungus there. However, if they are carried by the wind or other means to the leaves of wheat plants, each aecidiospore produces one or two germ-tubes which enter through the stomata of the wheat leaves and give rise to a mycelium from which uredospores are produced. We thus observe that during its life-cycle the fungus bears three different forms of chlamydospores, namely, secidiospores on the barberry in spring, uredospores on wheat in summer, and teleutospores in late summer also on wheat. The two former. —A, .^Ecidia or ' cluster-cups' of Puccinia coronata Corda. on a leaf of black alder {Rhancnus Frangula L.) (10 times natural). B, Transverse section through a leaf of black alder infected with P. coronata: a spermogonium of the fungus ; / peridium of the jecidium or cluster-cup; s free aecidiospore. (Enlarged 60 diameters.) kinds of spore are single cells and germinate immediately with the formation of a simple hyphae, while the latter are bicellular resting-spores which only germinate after hibernating several months, and then produce basidia bearing basidiospores instead of simple vegetative hyphse. Before any relationship between them was known, the three stages of the fungus were referred to as three distinct species belonging to the genera Vadium, Uredo, and Puccinia 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 Percival, John, 1863-1949. New York, H. Holt
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