. Annalen der South African Museum = Annale van sterben Suid-Afrikaanse Museum. Natural History. 72 Annalen der South African Museum.. Abb. 1.- Lang. Tang. abs. Holz anzeigen medul-lary Strahlen. x 55. tiefer Strahlen, 8-12 Zellen oder sogar 20 Zellen, auftreten. Eine Erscheinung von noch tieferen Strahlen kann durch die Annäherung von zahlreichen kleinen Strahlen (Abb. gegeben werden. 1). Die tracheiden bilden den Wald zeigen Unterschiede in der Größe und Dicke der Wände in verschiedenen Mustern. Diese Unterschiede scheinen vor allem durch den Zustand der Erhaltung und den Zustand der Probe bei der Erhaltung statt. In som

• Bildanbieter: Library Book Collection / Alamy Stock Foto
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. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 72 Annals of the South African Museum.. Fig. 1.—Long. tang. sect. wood showing medul- lary rays. x 55. deeper rays, 8-12 cells or even 20 cells, occur. An appearance of even deeper rays may be given by the close approximation of numerous small rays (fig. 1). The tracheids forming the wood show differences in size and thick- ness of the walls in different specimens. These differences seem largely due to the state of preservation and to the condition of the specimen when preservation took place. In some, pits are easily visible, in others they are very faint or absent. There are bordered pits on their radial walls. The bordered pits are circular, and occur in a single row, or in two rows, when the pits are oppo- site to one another. In some cases one tracheid may show bordered pits, both paired and single, and in such cases occasional alternating pits are found. The bordered pits may be separate or in contact. In the latter case they may be somewhat flattened along the line of contact. Polygonal pits do not occur (fig. 2). Thickened rims, rims of Sanio, between the pits are generally present and sometimes very distinct. In some they seem absent, but as these are the least well preserved the negative evidence is of little value. The pits on the tracheids occur in groups towards the ends of the cells and in the neighbourhood of medullary rays. No resin canals are present either in the wood or in the medullary rays. In most of the specimens wood alone is preserved, but in a few the central parts are preserved: both stems and roots occur which show no noticeable differences apart from the primary structures. In stems the central pith is of small size and parenchymatous with cells rounded in cross-section and not much elongated longitudinally. The primary xylem projects into the pith. No specimen shows any detail in the primary wood. The roots have a solid core. The primary xyl

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• bookcentury1800
• bookdecade1890
• booksubjectnaturalhistory
• booky