Essentials of Botany

Essentials of Botany

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...Mostly saprophytes; fruit-spores many, on stalks, Class 7, Basidiomyceteve Large green fresh-water plants; fruit-spore one, Class 8, Charophycee Class 4. CoLEOCHiETE.E. The Simple Fruit-tangles. 299. The genus Coleochaete, representing the single order CoLEOCHiETACE/E, shows us the simplest form of sexual reproduction among the Carpophytes. The species are all minute green fresh-water plants, composed of branching filaments, which are arranged radially; the diameter of each cushion-like mass is from 1 to 2 mm. (.04 to.08 in.) or less. 300. Asexual reproduction is by means of ciliated zoospores, one of which may form in each cell and escape through a round hole in the cell-wall (D, Fig. 92). 301. In the sexual process the female organ, the carpogone, is a single cell, wide below and tapering above into a long slender canal, the trichogyne, which is open at its apex (A, og, Fig. 92). In the swollen basal portion there Fig. 92.--Coleochaete. an, antherids; og, carpogones, each with a trichogyne; z, z, antherozoids; J?, fertilized carpogone, surrounded by the covering, n"pericarp"), the whole forming the spore-fruit; C, sporefruits burst open, showing interior tissues; D, zoospores from C. Magnified 350 times. is a considerable mass of protoplasm, which is the essential part to be fertilized. The male organs, the antherids, are formed as flask-shaped protuberances which grow out of adjoining cells. In each antherid a single oval biciliate antherozoid is formed (A, z, z, Fig. 92). 302. Fertilization is doubtless effected by these antherozoids coming in contact with the protoplasm of the carpogone, but the actual entrance of the former has not yet been seen. After fertilization the protoplasm in the carpogone increases considerably in size, ...show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236628551
  • 9781236628558