. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 196 ASCOMYCETES. other characters cDincide ; this seems to be all the more justifiable since one finds on the same species asci witli spores made up of one, two, or four cells. Trichosphaeria parasitica Hartig.^ (Britain and America.) Everywhere in young naturally regenerated woods of silver fir, especially in damp places or wdiere the plants are crowded, one finds partially browned needles hanging loosely from t
. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 196 ASCOMYCETES. other characters cDincide ; this seems to be all the more justifiable since one finds on the same species asci witli spores made up of one, two, or four cells. Trichosphaeria parasitica Hartig.^ (Britain and America.) Everywhere in young naturally regenerated woods of silver fir, especially in damp places or wdiere the plants are crowded, one finds partially browned needles hanging loosely from the twigs, held only l)y a fine white mycelium (Fig. 87). In addition to this, one finds in spring young twigs completely enveloped in mycelium, with all their. Fig. S7.—Trichosphaeria parasitica on Silver Fir. The withered and dead needles hang loosely downwards, attached to the twig only by a white mycelium. (V. Tubeuf phot.) needles killed, so that the twig itself soon dies. The white mycelium grows especially on the under side of the shoot, and on the lower epidermis of the horizontal needles. A pseudoparenchyma, consisting of layers of mycelium, is there laid down, the lowest layer of hyphae sending short cone- shaped haustoria into the walls of the epidermal cells (Fig. 88). Inside the needles, occupying the intercellular spaces, there are numerous branches of septate hyphae, which kill the cells of the leaf. The perithecia occur here and there on the mycelial coating outside the leaf; they are spherical and blackish, with radiating hairs. They contain paraphyses and ^ R. Hartig, " Ein neuer Parasit d. ; Alhg. For>ii,-u. Jayd- Zeitung, Jan., 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. London, New York [etc. ] : Longmans, Green &
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
