. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 408 UBEDINEAE. cone rust. This disease is found on the cones of spruce. The aecidia are brown somewhat flattened spheres, and appear in large numbers on cones distinguished by their scales standing stiffly open even in damp weather (Fig. 243). The germ- tubes of the fungus find entrance in spring into the flowers or young spruce-cones, and the mycelium lives parasitic in the green scales without causing any marked c
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 408 UBEDINEAE. cone rust. This disease is found on the cones of spruce. The aecidia are brown somewhat flattened spheres, and appear in large numbers on cones distinguished by their scales standing stiffly open even in damp weather (Fig. 243). The germ- tubes of the fungus find entrance in spring into the flowers or young spruce-cones, and the mycelium lives parasitic in the green scales without causing any marked change in their growth, although the ovules are more or less injured. No mycelium has ever been found in the lower cone-axis, nor in the shoots, so that the disease must be the result of in- fection by spores _par 3 Fig. 244.—Aecidium sti-obilinum, 1, Cone-scale of Spruce witli aecidia, those to left dehiscing^ their yellow spores, those to right still closed, (v. Tubeuf del.) 2, Section through an immature aecidium. 3, Part of 2 enlarged—pei-, peridium; up, spores; zw, intermediate cells; sptr^ sporophores; m, mycelium; pavy the scale-parenchyma. (After Reess.) The aecidia break out on the inner (rarely the outer) side of the bases of the cone-scales; each is enclosed in a firm brown lignified peridium, which ruptures by a cross-fissure and becomes an open disc. The young spores are joined by small intermediate cells, which are gradually absorbed to form a layer of gelatinous lamellae on the spore-coats (Fig. 244). Teleutospores of this Aecidium are 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.
Size: 2110px × 1184px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
