By Peregudova Elvira Shakirovna, Pastuh Kuzovlev Vladimir Petrovich
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Additional resources for Angliyskiy yazyk. Grammaticheskiy spravochnik s uprazhneniyami. 2 klass. FGOS
Palm stems comprise a large central core of primary vascular bundles embedded in a parenchymatous ground tissue (Figs. 105 and 106), surrounded by a cortex . In some palms the density and texture of the central core of 'wood' varies greatly between different parts of the stem. The basic density decreases with increasing height in the stem and increases from the stem centre to the outside at anyone height . The typical range of basic density in Cocos nucifera, for example, is 100 - 900 kg/ m 3 which is considerably greater than that found in anyone softwood or hardwood.
Fully biseriate rays are unusual in all but a few softwoods . Ray height, that is, the number of cells in vertical extent also varies with species. In most softwoods rays up to 15 cells high can be found. The highest rays, sometimes in excess of 60 cells high, have been found in Sequoia sempervirens. Ray parenchyma cells generally have primary walls only, but secondary thickening can occur in some species (Figs. 80 and 82) especially in heartwood . They are the only cell type present in the rays of many softwoods.
A secondary wall is deposited over the primary wall of each differentiating vessel element after the cell has reached its final size. The pits and areas to be perforated do not become overlaid with secondary wall though both may be over arched by prominent borders of wall material [117l. Perforation partitions (Figs. 148 and 149), composed of the primary walls of the adjoining cells and the intervening middle lamella in the area to be Fig. 142. A part scalariform - part reticulate perforation plate between two vessel elements in Platanus acerifolia Willd.
Angliyskiy yazyk. Grammaticheskiy spravochnik s uprazhneniyami. 2 klass. FGOS by Peregudova Elvira Shakirovna, Pastuh Kuzovlev Vladimir Petrovich