. The British rust fungi (Uredinales) their biology and classification. Rust fungi. GYMNOSPORANGIUM CLAVARI^FOEME irigmata, much in the same way in which the basidiospores i thrown off in the Agaricini^ They accumulate in large mbers on the outside of the mucilaginous mass, and present 3 appearance of a golden-yellow powder. The mycelium of 3 fungus is perennial in the Juniper, spreading from branch branch and producing a fresh crop of teleutospores each spring. If one of the basidiospores is blown by the wind or carried insects to a moist leaf or young fruit or stem of Hawthorn, germinates an
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. GYMNOSPORANGIUM CLAVARI^FOEME irigmata, much in the same way in which the basidiospores i thrown off in the Agaricini^ They accumulate in large mbers on the outside of the mucilaginous mass, and present 3 appearance of a golden-yellow powder. The mycelium of 3 fungus is perennial in the Juniper, spreading from branch branch and producing a fresh crop of teleutospores each spring. If one of the basidiospores is blown by the wind or carried insects to a moist leaf or young fruit or stem of Hawthorn, germinates and bores through the cuticle in the ordinary y, and forms there a limited patch of mycelium. It is said at the infection has been known to be conveyed for half. ;. 31. Oymnosporangium clavariaeforine. .Xcidia on leaf, fruit, and branch of Hawthorn (reduced); ti, peridium, x 16. The fruit and gall on branch are shown as they appear when the peridia are old, and the mass looks somewhat like a honeycomb. mile. This mycelium produces the secidium-stage, which is t usually seen until the end of June, in about 18—20 days, le secidia are not of the ordinary cup-like shape, but of the •m called Roestelia: they are cylindrical, brown at the base d ochreous above where the peridium is torn into numerous snder filaments (Fig. 31). On the leaves they appear in iindish patches a few mm. in diameter, but on the twigs ey form large spongy masses and the fruits are often so vered with them as to look like a cluster of little spikes. ' I am indebted to Professor BuUer for calling my attention to this 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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