Contributions from the Botanical Laboratory of the University of Pennsylvania Volume 5, No. 1

Contributions from the Botanical Laboratory of the University of Pennsylvania Volume 5, No. 1

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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. 1919 edition. Excerpt: ...have hyphae in the roots. The writer has not been able to get fresh material of this for examination. Moneses uniflora is reported by Irmisch (32) to have fungal hyphae in the roots. In Monotropa hypopitys (Fig. 1, 3) Kamienski (39) and Drude (11) describe the root tip as having one to two layers of root cap, Drude claiming that in one variety--hirsuta--there are two layers, and in glabra only one. Kamienski, however, says that the number of layers may vary in the same individual. The material examined shows one to two layers of root cap, the outer layer crushed and flattened. All the cells at the tip are very much alike, differentiation into plerome and periblem occurring some distance back from the tip. Kamienski (39) and Peklo (59) have given complete descriptions and accurate figures of the root tip of M. hypopitys. In the Chimaphila and Pyrola species described the fungus does not seem to invade the root cap region either in the root cap itself, over its surface, or in the epidermal cells beneath. In M. hypopitys, though the epidermal cells under the root cap and the root cap cells are not infested, the mycelium extends over the surface of the root cap--though thinner here than over the rest of the root. As in P. rotundifolia there is a development of pseudoparenchyma between the epidermal cells and a continuation of this on the exterior forming a sheath much greater in thickness than in P. rotundifolia. This outer sheath consists of two regions, the inner composed of closely intertwined hyphae, the outer of more loosely arranged threads that stray out into the soil. Kamienski claims that the hyphae never penetrate the epidermal cells, but that sometimes in older parts a hypha may penetrate an epidermal cell, which it fills with a more

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  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236680200
  • 9781236680204