. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. THE PARASITIC EXOASCEAE. 163 are somewhat curled up, and the asci appear on their lower surface.! Exoascus cerasi Fuck, occurs very commonly on cherry trees (Frunus Cerasus and P. avium) both in Europe and America.^ It produces witches' brooms, which may be large, upwardly directed, bush-like, and very conspicuous structures, with numerous thickened and elongated twigs (Fig. 3); or they may be small, hanging bunches
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. THE PARASITIC EXOASCEAE. 163 are somewhat curled up, and the asci appear on their lower surface.! Exoascus cerasi Fuck, occurs very commonly on cherry trees (Frunus Cerasus and P. avium) both in Europe and America.^ It produces witches' brooms, which may be large, upwardly directed, bush-like, and very conspicuous structures, with numerous thickened and elongated twigs (Fig. 3); or they may be small, hanging bunches of twigs with upturned free ends. The leaves are somewhat wavy, slightly crumpled, and reddish; on their lower epidermis they bear asci, and fall off Fig. 58.—Normal twig of Cherry from a tree in blossom, as in Fig. 57. (T. Tubeuf phot.) The brooms are visible at a considerable distance in the winter (Fig. 56), while they are even more conspicuous during the flowering season (Fig. 57). At the latter time, before the leaf-buds open, the cherry trees are normally covered with white blossom, while the brooms bear leaves only, and rarely blossom. Hence they produce little or no fruit. Each tree 1 Wehmer {Bot. Zeitung 1896) discusses the formation of these witches' "brooms. (Edit.) - E. Rathay, "Uber die Hexenbesen d. ;—Sitzungsber. d. K. K. Akad. zu Wien, 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 Tubeuf, Karl, freiherr von, 1862-1941; Smith, William G. London ; New York [etc. ] : Longmans, Green & co.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
