. The British rust fungi (Uredinales), their biology and classification. Uredineae. 334 ENDOPHYLLUM Teleutospores. Sori hypophyllous, or occasionally epiphyllous, more or less covering the whole surface, crowded, secidium-like, sunk in the leaf-tissue Avhich is slightly swollen, surrounded by a thin peridium in the shape of a shallow cup, with a Fig. 251. E. Euphorbiae-silraticae. a, affected leaf of E. amycjdnloides, nat. size; h, ascidio-telentospore; c, germinating spore ; d, another, not so advanced, x 540 ; e, inner, and /, outer wall of peridium-cell, x 600. torn, slightly re vol
. The British rust fungi (Uredinales), their biology and classification. Uredineae. 334 ENDOPHYLLUM Teleutospores. Sori hypophyllous, or occasionally epiphyllous, more or less covering the whole surface, crowded, secidium-like, sunk in the leaf-tissue Avhich is slightly swollen, surrounded by a thin peridium in the shape of a shallow cup, with a Fig. 251. E. Euphorbiae-silraticae. a, affected leaf of E. amycjdnloides, nat. size; h, ascidio-telentospore; c, germinating spore ; d, another, not so advanced, x 540 ; e, inner, and /, outer wall of peridium-cell, x 600. torn, slightly re volute margin; spores in evident chains, bluntly polygonal or subglobose, densely but finely verruculose, orange, 18—23/a; epispore about l/t thick; basidiosporesobovate, yellow. On Euphorhia amygdaloides (= E. silvatica). Rather un- common. April—June. (Fig. 251.) The mycelium usually perennates in tlie plant. The affected shoots are taller than the normal ones, with shorter, wider and paler leaves; they seldom flower. This species externally closely resembles an aecidium, and can be distinguished from one only b}^ the different mode of germina- tion of the spores. The jecidia which occur on other species of Etiphorbia 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, William Bywater. Cambridge, Univ. Press
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambr, bookyear1913
