Proceedings of the American Academy of Arts and Sciences Volume N . 48

Proceedings of the American Academy of Arts and Sciences Volume N . 48

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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. 1913 edition. Excerpt: ...The primordia that are produced later, are hindered in their upward growth by the presence of the first formed bulbils, which, however, are soon broken away from their attachments and pushed up so that eventually several irregular layers of independent spherical bodies are produced, the oldest ones being on the surface. Whether the vertical hyphae first formed fuse at the apex could not be determined. They evidently receive some stimulus, for they begin to send out short branches in different directions, which in turn divide and subdivide, and these intertwine among themselves and, with other hyphae that grow up from the original horizontal branches, form an interlacing weft which becomes more and more compact, producing a hyaline, spherical body in which the walls are very thin and almost indistinguishable except after staining. As they increase in size they assume a brownish tint and finally a rich tan-color, during which time the walls gradually become more definite and eventually are well marked. Since liquid media appeared to have a peculiar affect on the development of these bulbils, cultures were tried in large flasks on pieces of wood partly immersed in bran decoction, so that the effect of different degrees of moisture might be observed, as the mycelium spread from the liquid medium toward the dryer portions of the wood. Under these conditions it was found that the bulbils formed on the wood about three or four inches above the liquid, began to assume a paler aspect and soon became light straw-colored, instead of the dark tan of the normal bulbil. On examination it was found that the cells composing these pale bulbils, instead of being compact with angular walls as in the normal form, had rounded up and become spherical (17-22 n in...show more

Product details

  • Paperback | 198 pages
  • 189 x 246 x 11mm | 363g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236571185
  • 9781236571182