The Transactions of the Royal Irish Academy Volume 26

The Transactions of the Royal Irish Academy Volume 26

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 edition. Excerpt: ..."Les zoospores issus de ces deux organes off rent une parfaite ressemblance. Seulemcnt ceux qui proviennent des sporanges filamenteux sont un peu plus grands que ceux qui s'echappent des sporanges ovoides. J'ai vu d'ailleurs germer les uns et les autres, ce qui prouve suffisament leur complete identitt "f--I determined in the present case to watch the development and escape of the spores. Those of the round utricle-like cells, which I took for Thuret's Oosporangia, ripened first. The colourless protoplasm, to use almost Braun's words, started not by a successive division, but by a simulta Thuret, " Recherches zur les zoospores des Algues," Annales des Sciences Naturelles, Troisieme Serie. Botanique. Tome 14, 1850. Planche 24, V., figs. 5, 6. t Thuret, he. cit., p. 236. neous process, into a great number of small globular spore-cells, which exhibited a sharply-defined dark nucleus in their interior; after a short interval the outline of the cell changed; sometimes it protruded itself into a wide funnel-shaped projection, which stood out from the edge of the filament of the Ectocarpus, and the apical portion of this neck-like process frequently divided into two circular openings--sometimes but one appeared--and through these the zoospores with one long cilium escaped (Plate VI., figs. 1, 2, 3, and 4). There could no longer be any doubt but that I was wrong in taking these unicellular forms for true fruits (Oosporangia) of the Ectocarpus, and there was just as little that I had a species of Chytridium living parasitic in and on its cells. A few days later, the Trichosporangial fruits also ripened, and their spores made their exit through small openings in the upper corner of each cell-wall, the whole mass first...show more

Product details

  • Paperback
  • 189 x 246 x 8mm | 286g
  • Rarebooksclub.com
  • English
  • Illustrations, black and white
  • 1236877713
  • 9781236877710