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| Registros recuperados: 16 | |
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| Vliet, G.J.C.M. van; Koek-Noorman, J.; Welle, B.J.H. ter. |
| A classification of the Melastomataceae, modified on the basis of wood anatomical evidence, is discussed. Three subfamilies (Crypteronioideae, Memecyloideae and Melastomatoideae) are recognized . Astronioideae, recognized in other classifications, are abolished and their constituent genera are classified in Memecyloideae (Pternandra) and Melastomatoideae (four genera of the tribe Astronieae). Wood anatomically Melastomataceae show affinities with a number of Myrtalean families, notably with Lythraceae, Onagraceae and Myrtaceae. The wood anatomy of ancestral ‘Protomelastomataceae’ is hypothesized and a tentative phylogeny is suggested for the extant subfamilies and tribes. |
| Tipo: Article / Letter to the editor |
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| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/526094 |
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| Welle, B.J.H. ter; Koek-Noorman, J.; Topper, S.M.C.. |
| The wood anatomy of the genera of the tribe Moreae with urticaceous stamens, viz. Broussonetia, Madura s.l. (including Cardiogyne, Chlorophora, and Cudrania), Malaisia, Milicia, Morus, Olmedia, Pachytrophe, Plecospermum, Sloetiopsis, Streblus s.l. (including Paratrophis, Phyllochlamys, Pseudostreblus, and Sloetia), and Trophis s.l.(including Calpidochlamys and Maillardia), is described in detail. Separate descriptions have been made for sections and/or subgenera to facilitate the discussion about the generic delimitations made by several taxonomists. The following generic combinations previously proposed by taxonomists are supported by wood anatomical features: Broussonetia + Allaeanthus: Maclura + Chlorophora + Cardiogyne + Cudrania + Plecospermum. The... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Moraceae; Moreae; Urticales; Systematic wood anatomy. |
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/535270 |
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| Welle, B.J.H. ter. |
| Distribution patterns, frequency, size, shape, and surface texture of silica grains in the secondary xylem of neotropical taxa, especially from Surinam were studied extensively. Over 2000 samples were examined. Silica grains occur in about 300 species (32 families and about 90 genera). The grains proved to be present in many taxa so far considered as non-siliceous. They are most frequently found in the parenchymatous tissues (in 80% of siliceous material studied, grains were present in the ray cells). Their distribution is very constant, especially when they are restricted to one type of tissue, although some exceptions exist. The diagnostic value of the silica grains, often neglected, appears to be very high. The shape of the grains is usually variable... |
| Tipo: Article / Letter to the editor |
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| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/508212 |
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| Welle, B.J.H. ter. |
| Distribution patterns, frequency, size, shape, and surface texture of silica grains in the secondary xylem of neotropical taxa, especially from Surinam were studied extensively. Over 2000 samples were examined. Silica grains occur in about 300 species (32 families and about 90 genera). The grains proved to be present in many taxa so far considered as non-siliceous. They are most frequently found in the parenchymatous tissues (in 80% of siliceous material studied, grains were present in the ray cells). Their distribution is very constant, especially when they are restricted to one type of tissue, although some exceptions exist. The diagnostic value of the silica grains, often neglected, appears to be very high. The shape of the grains is usually variable... |
| Tipo: Article / Letter to the editor |
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| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/534739 |
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| Welle, B.J.H. ter; Loureiro, A.A.; Lisboa, P.L.B.; Koek-Noorman, J.. |
| Systematic wood anatomy of the tribe Guettardeae (Rubiaceae). The wood anatomy of nearly all genera of the Guettardeae (Rubiaceae, Guettardoideae) has been examined, and in this respect the tribe is heterogeneous. Suggestions are made for a delimitation of the tribe. Guettarda, Bobea, Antirhea, Malanea and Chomelia Jacq. are sufficiently similar in their wood anatomical characters to warrant retention in the same tribe. Machaonia, Timonius and Dichilanthe are anomalous. Suggestions are given for taxonomic revisions of some genera based on their wood anatomy. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Guettardeae; Rubiaceae; Taxonomy; Wood anatomy. |
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/535135 |
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| Welle, B.J.H. ter. |
| Spiral thickenings in the axial parenchyma, seldom recorded in the secondary xylem of the dicotyledons so far, are described for a number of genera and/or species of Chrysobalanaceae. In 66 out of 99 samples investigated, representing most genera of the Chrysobalanaceae, spiral thickenings proved to be present. Some genera, such as Parinari, lack spirals while others like Chrysobalanus, Exellodendron and Hirtella comprise only species with spiral thickenings. In Acioa, Couepia, Cyclandrophora, Licania and Maranthes only a part of the species have spirals in their parenchyma cells. Data on distribution and appearance are given. No connection with tension wood could be demonstrated, neither is the presence related to juvenile wood. Taxonomic value of the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/534912 |
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| Koek-Noorman, J.; Welle, B.J.H. ter. |
| The shedding of branches along a preformed layer is a complex phenomenon in which several types of xylem elements are involved. The abscission layers in Perebea mollis and Naucleopsis guianensis are distinguished from the normally developed xylem by the presence of shorter unlignified fibres with small simple pits. Most of these fibres show large nuclei. In this zone containing abnormal fibres, the vessels, rays and parenchyma are conspicuously different from those of the normal tissue. The transition in anatomy from the main branch to the abscission layer is much more abrupt than that from the abscission layer to the secondary branch. Contrary to what is generally seen in other Moraceous tribes, natural pruning seems to occur in all genera of Olmedieae... |
| Tipo: Article / Letter to the editor |
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| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/535008 |
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| Koek-Noorman, J.; Hogeweg, P.; Maanen, W.H.M. van; Welle, B.J.H. ter. |
| The present paper deals with the wood anatomy of the Blakeeae (Melastomataceae). Generic descriptions of the secondary xylem of Blakea, Topobea, and Huilaea are given and compared with data on 16 genera of the Miconieae. Numerical pattern detection was undertaken. The results confirm our preliminary ideas that Blakea and Topobea do not differ enough to enable the separation of these genera on the basis of their wood anatomy. Within the Miconieae it is not possible to separate the genera. However, some anatomical differences between the two tribes were found. The genus Huilaea seems to belong in the Blakeeae although it also shows similarities with the Miconieae. Wurdack’s suggestion (pers. comm.) that the Blakeeae are closest to the genera Loreya and... |
| Tipo: Article / Letter to the editor |
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| Ano: 1979 |
URL: http://www.repository.naturalis.nl/record/534790 |
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| Bonsen, K.J.; Welle, B.J.H. ter. |
| The wood anatomy of all tribes of the Urticaceae, a family of herbs, shrublets, and sometimes shrubs, trees or lianas, has been studied and described in detail. Special attention is given to the interpretation of the characters in terms of taxonomy and phylogeny. A classification, in part deviating from the existing morphological classification, is presented. Finally, the relationship within the Urticaceae, as well as the relationships with the Ulmaceae and Moraceae (including Cecropiaceae) are discussed. |
| Tipo: Article / Letter to the editor |
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| Ano: 1984 |
URL: http://www.repository.naturalis.nl/record/534696 |
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| Welle, B.J.H. ter; Koek-Noorman, J.. |
| A preliminary account is given of the parenchyma-like tangential bands, as seen on the transverse surface of Miconia species. The bands consist of parenchyma strands, fusiform parenchyma cells and fibres. These fibres differ from the fibres of the ground tissue in wall thickness, lumen diameter and sometimes in pit size. In the bands intermediate forms between parenchyma cells and fibres occur. The functional relationship between the elements forming the parenchyma-like bands is discussed. The systematic value of this phenomenon is still uncertain. In other genera of the Melastomataceae, however, as well as in other families of the Myrtales it has also been observed. |
| Tipo: Article / Letter to the editor |
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| Ano: 1978 |
URL: http://www.repository.naturalis.nl/record/534942 |
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| Welle, B.J.H. ter; Koek-Noorman, J.; Topper, S.M.C.. |
| The wood anatomy of the Moreae without urticaceous stamens is described in detail. Generic descriptions of the following genera are provided: Antiaropsis, Artocarpus, Bagassa, Batocarpus, Clarisia, Parartocarpus, Poulsenia, Prainea, Sorocea, Sparattosyce, and Treculia. Wood anatomical variation below the genus level is very limited, except in the genus Clarisia. Intergeneric variation, however, is much more evident. Most genera can be recognised by the presence or absence of septate fibres, and of radial latex tubes, the size of the intervascular pits, the parenchyma distribution, and crystal distribution. The diagnostic and taxonomic value of several characters is discussed. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Moraceae; Moreae; Systematic wood anatomy. |
| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/535256 |
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| Koek-Noorman, J.; Welle, B.J.H. ter. |
| The shedding of branches along a preformed layer is a complex phenomenon in which several types of xylem elements are involved. The abscission layers in Perebea mollis and Naucleopsis guianensis are distinguished from the normally developed xylem by the presence of shorter unlignified fibres with small simple pits. Most of these fibres show large nuclei. In this zone containing abnormal fibres, the vessels, rays and parenchyma are conspicuously different from those of the normal tissue. The transition in anatomy from the main branch to the abscission layer is much more abrupt than that from the abscission layer to the secondary branch. Contrary to what is generally seen in other Moraceous tribes, natural pruning seems to occur in all genera of Olmedieae... |
| Tipo: Article / Letter to the editor |
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| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/508213 |
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| Registros recuperados: 16 | |
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