Download e-book for iPad: New Perspectives in Wood Anatomy: Published on the occasion by William Louis Stern (auth.), P. Baas (eds.)

By William Louis Stern (auth.), P. Baas (eds.)

ISBN-10: 9048182697

ISBN-13: 9789048182695

ISBN-10: 9401724180

ISBN-13: 9789401724180

On the party of the fiftieth Anniversary of the overseas organization of wooden Anatomists numerous symposia have been held in the course of the thirteenth overseas Botanical Congress in Sydney, August 1981. prolonged models of many of the invited papers provided there, and a few extra papers on points that could no longer be integrated within the congress software represent the contents of this publication, which deliberately acquired the pretentious name 'New views in wooden Anatomy'. to a few readers it could possibly appear a paradox that less than this heading papers on a range of in part conventional wooden anatomical matters are assembled, even together with with a historic emphasis. besides the fact that, a research of the heritage of wooden anatomy and of ways scholars of that self-discipline joined forces in an inter­ nationwide organization, brings to gentle many proof and perspectives which deserve the eye of modern-day and destiny wooden scientists as a possible resource of in­ spiration for his or her learn and organisational work.

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Additional resources for New Perspectives in Wood Anatomy: Published on the occasion of the 50th Anniversary of the International Association of Wood Anatomists

Sample text

De Candolle (1818) had used presence or absence of vessels in his plant classification. Yet, critical studies based on extensive research materials had to wait until the second half of the century. , superficial external characters). Sanio (1863), who studied about 150 genera, arrived at the more balanced opinion that wood anatomical features have a relative systematic value, like all other morphological characters. He based this opinion on patterns of variation he observed in obviously related taxa, such as species of one genus and genera of one family, and noted that characters constant in one assemblage could vary in others.

2. Transverse and tangential 27 should be credited for a first correct description of bordered pits ('globules' in the walls with a light central dot), perforation rims in vessels, and even a correct observation of the macrofibrillar arrangement in the vessel walls of nutmeg rootwood. Although his ideas on wood ontogeny were totally wrong - he imagined the new wood and bark to be produced from the wood rays, while his contemporaries were just a little nearer the truth by assuming that the wood was formed by the bark - he had a shrewd understanding of tree growth and the influence of climatic conditions on growth ring width and mechanical properties.

Those that had their first pollen record in the Cretaceous or Paleocene) the values are subject to much chance fluctuation. Yet the pattern for vessel perforations, fibre type and parenchyma distribution are consistent in showing a much higher incidence of primitive character states (scalariform perforations, fibre-tracheids, apotracheal parenchyma) in the families of Cretaceous age as compared with the extant flora. For the small number of 41 families that had their (pollen morphological) origin in the Paleocene the pattern is more or less similar to that in the extant flora, with only a slightly higher incidence of primitive characters.

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New Perspectives in Wood Anatomy: Published on the occasion of the 50th Anniversary of the International Association of Wood Anatomists by William Louis Stern (auth.), P. Baas (eds.)

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