. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. EFFECT <»F PARASITIC FUN<;i ON THE FORM OF the ovules become atrophied, whereas the rest of the flower is hypertrophied. Similarly witli flowers of cowberry deformed Ity ExohamUvm. 2. Hypertrophy.—^lany para- sitic fungi cause abnormal enlarge- ment or other malformation of plants which they attack. The simplest case of hypertrophy is seen in the enlargement of a uni- cellula
. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. EFFECT <»F PARASITIC FUN<;i ON THE FORM OF the ovules become atrophied, whereas the rest of the flower is hypertrophied. Similarly witli flowers of cowberry deformed Ity ExohamUvm. 2. Hypertrophy.—^lany para- sitic fungi cause abnormal enlarge- ment or other malformation of plants which they attack. The simplest case of hypertrophy is seen in the enlargement of a uni- cellular plant as a result of an endophytic parasite, Pilobolus Kleinii with Flcofrachdus. The same example is also tlu- simplest possible case of a gall caused by a plant, and distin- guished by the name of " fungus- galls " or Mycocecidia, from Zooce- cidia, the galls caused by animals. Larger galls occur on leaves attacked by Synchytrinm, where not only the single cell attacked becomes enlarged, but also the surinunding cells; these galls, however, form but tiny points on diseased leaves. Similar small and local enlargements of the leaf-cells, accompanied frequently by cell multiplication, are caused by many other fungi, c.(j. species of Exoasciis. More extensive malformation may embrace some part or even the whole leaf, so that it is more or less enlarged and beset with l»lister-like outgrowths, as with other Exoasceae (see Figs. 62 and 64). Other gall-forms are presented by Eivhafiiilivm on the alpine-rose (Fig. 250), where the gall is always hjcalized t<j a small area of the leaf, and '( tlii-~ will Fig. ".—Fruit of plum deformed by Exoascus pi-uni; the stone is shrivelled and abortive. 4 natural size. (v. Tubeuf phot.). 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
