Studies of Tropical American Ferns Volume 2

Studies of Tropical American Ferns Volume 2

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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. 1909 edition. Excerpt: ...more upon vegetative reproduction and less upon the dispersal of spores.a Whatever may have been the cause of this correlation between habitat and form, the characters appear to be fixed and constant and the species amply distinct and recognizable. Thus no form of true P. triangulum, so far as the writer has observed, is proliferous, though this is a marked feature of several of its closest relatives. The status of P. heterolepis, discussed below, is interesting from another point of view; that of a species apparently not re-collected in its typical form from the time of its discovery up to 1907. The P. viviparum of Fee is now found to be merely a young state of this strictly Cuban species and quite different from the Jamaican plant described as viviparum by Jenman and others. These and several others are here illustrated from photographs of the most typical a In the case of P. rhizophorum this is manifest in a strong tendency toward dimorphism, the fertile fronds being rigidly erect and usually very much smaller than the elongate and radicant sterile ones. specimens, with the idea of fixing more exactly than is possible by description alone the characteristic points of difference. In conclusion, notes upon the several West Indian species to be excluded from this genus are presented. The species as here treated may be separated by the following artificial key. The specimens listed are either in the U. S. National Herbarium or the herbarium of the New York Botanical Garden, unless otherwise stated. KEY TO THE SPECIES. Rhizome sarmentose; fronds uniserial ( Rumohra) 2. P. adianti/orme. Rhizome erect or ascending; fronds cespitose ( Eupolystichum). Lamina subentire to deeply pinnatifid. Lamina Bubentire, somewhat lobed at the...show more

Product details

  • Paperback
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236938615
  • 9781236938619