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| Lam, H.J.; Varossieau, W.W.. |
| The genus Sarcosperma was excluded from the Sapotaceae by the first-named writer in 1925, the group being considered as of family rank. In 1926 the same author published a concise and fragmentary revision of the monotypic order, in which two new Malaysian species were described. The continental species, however, were merely quoted from literature. To this a key was added. As since then more material has been collected, it seemed desirable to give a new revision of this small but interesting order. For this purpose materials have, at our request, kindly been sent on loan to the Rijksherbarium (L) ¹) from the following institutions: Royal Botanic Gardens, Kew — K. Botanischer Garten und Botanisches Museum, Berlin — B. Musee d’Histoire Naturelle,... |
| Tipo: Article / Letter to the editor |
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| Ano: 1938 |
URL: http://www.repository.naturalis.nl/record/524479 |
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| Pfeiffer, J.Ph.; Varossieau, W.W.. |
| 1. The literature gives various methods to compile a universal scheme for the classification and identification of wood species. To attain this object a new method is now given possessing various advantages over the methods that have been used so far. 2. The wood structure is subsequently described using decimal indices. Each of five sections of features are divided into four groups, and these again in subgroups, which have been worked out by means of indices. In the treatment of various features literature data are discussed. The classification of wood species aims at obtaining a grouping which, as far as possible, links up with the botanical groupings according to natural systems. 3. On the grounds given in the introduction and the discussion, the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1945 |
URL: http://www.repository.naturalis.nl/record/526100 |
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| Varossieau, W.W.. |
| The International Association of Wood Anatomists in the early years of its existence has undertaken to standardize the nomenclature used in describing woods. Later the classes of dimensions have been added thereinto. In the same way it should be possible now to standardize one or two identification methods. Universal schemes in the first place will fit for this purpose. In the introduction it is explained which requirements should be fulfilled in such schemes. The advantages and drawbacks of an English and a Dutch identification method are compared mutually. It is suggested, that a procedure according to the Hollerith system will allow of a synthesis of both methods mentioned, thus combining advantages and eliminating their drawbacks. The restriction in... |
| Tipo: Article / Letter to the editor |
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| Ano: 1947 |
URL: http://www.repository.naturalis.nl/record/526165 |
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| Varossieau, W.W.. |
| Summarizing, it appears that Eucommia has the greatest number of characters in common with the Urticales. This is shown by the similarity of the inflorescences as well as by the unisexual flowers and the dioecy. In both groups the pistil consists of 2 connate carpels and the ovary is usually 1-celled by abortion, while the stigmata are generally papillate. Further general points of relation with the Urticales are the originally spiral phyllotaxis, which becomes later on pseudo-distichous, simple vessel perforations, libriform with bordered pits, unicellular hairs and the occurrence of calciumcarbonate and silica as well as of latex elements. Yet, it seems difficult to indicate any particular family in the Urticales to which Eucommia should be most related.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/525811 |
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| Lam, H.J.; Varossieau, W.W.. |
| The present records are mainly based upon the collections by C. W. WANG in Yunnan, 1936. We are indebted to Dr E. D. MERRILL, Harvard University, Jamaica Plain, Mass., U.S.A., for putting these specimens to our disposal. Except for a few points, our views concerning the genus have not been essentially modified. The data mentioned are supplementary to those, published in our earlier paper: Revision of the Sarcospermataceae (Blumea 3, 1938, 183—200). |
| Tipo: Article / Letter to the editor |
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| Ano: 1939 |
URL: http://www.repository.naturalis.nl/record/525865 |
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