. The fungi which cause plant disease . Plant diseases; Fungi. 70 THE FUNGI WHICH CAUSE PLANT DISEASE spore. (Fig. 42.) After a more or less protracted period of rest this produces zoospores. The family includes some fifty species, all of which, except two small genera, are parasitic upon land plants. Key to Genera of Synchytriacese Zoosporangia formed by direct division of the entire plasma of the young fruiting body. Swarm sporangia completely filling the host cell, membrane united to the wall of the host cell I. Rozella. Swarm sporangia lying free in the host cell Parasitic on alg£e 2. Woro
. The fungi which cause plant disease . Plant diseases; Fungi. 70 THE FUNGI WHICH CAUSE PLANT DISEASE spore. (Fig. 42.) After a more or less protracted period of rest this produces zoospores. The family includes some fifty species, all of which, except two small genera, are parasitic upon land plants. Key to Genera of Synchytriacese Zoosporangia formed by direct division of the entire plasma of the young fruiting body. Swarm sporangia completely filling the host cell, membrane united to the wall of the host cell I. Rozella. Swarm sporangia lying free in the host cell Parasitic on alg£e 2. Woronina. Parasitic on land plants 3. Woroniella. Zoosporangia formed by division of an ini- tial cell to forma sorus of sporangial cells. Sporangia formed directly from the full- grown plant body 4. Synchytrium, p. 70. Sporangia formed by the division of a thin- walled mother cell after its escape from the plant body 5. Pycnochytrium, p. 72. Synchytrium de Bary & Woronin Upon reaching maturity the plant body develops directly into a sporangial sorus. Both zoosporangia and winter spores Fig. 41.—Showing nucleus in Synchytrium. After Stevens. S. endobioticum (Schilb.) Perc, the cause of a very serious wart disease of the potato, was originally described as Chrysophlyctis endobioticum by Schilberszky ^^ and transferred to Synchytrivun by ; It invaded America about ;^ It was reported from Africa by Zimmermann.'^. 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 Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
