. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 334 ENDOPHYLLUM Teleutospores. Sori hypophyllous, or occasionally epiphyllous, more or less covering the whole surface, crowded, secidium-like, sunk in the leaf-tissue which is slightly swollen, surrounded by a thin peridium in the shape of a shallow cup, with a short,. Fig. 251. -E. Euphoriiae-silvaticae. a, affected leaf of E. amygdaloides, nat. size; 6, a3oidio-teleutospore; c, germihating spore ; d, another, not so advanced, x 540; e, inner, and /, outer wall of peridium-cell, x 600. torn, slightly revolute
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 334 ENDOPHYLLUM Teleutospores. Sori hypophyllous, or occasionally epiphyllous, more or less covering the whole surface, crowded, secidium-like, sunk in the leaf-tissue which is slightly swollen, surrounded by a thin peridium in the shape of a shallow cup, with a short,. Fig. 251. -E. Euphoriiae-silvaticae. a, affected leaf of E. amygdaloides, nat. size; 6, a3oidio-teleutospore; c, germihating spore ; d, another, not so advanced, x 540; e, inner, and /, outer wall of peridium-cell, x 600. torn, slightly revolute margin-; spores in evident chains, bluntly polygonal or subglobose, densely but finely verruculose, orange, 18—23/Lt; epispore about I/a thick; basidiospores obovate, yellow. On Euphorbia amygdaloides (= E. silvatica). Rather un- common. April—June. (Fig. 251.) The mycelium usually perennates in the plant. The affected shoots are tailor than the normal ones, with shorter, wider and paler leaves; they seldom flower. This species externally closely resembles an secidium, and can be distinguished from one only by the diflerent mode of germina- tion of the spores. The secidia which occur on other species of Euphorbia belong to different life-cycles, Uromyces Pisi etc. The peridium of this species is more strongly developed than that of the following one; its cells are densely warted, and arranged in distinct rows. A long account of the behaviour of the parasite is given by Plowright (). The spores germinate readily in the summer as soon as produced. Distribution: 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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