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- Title
Zur Morphologie der Tracheiden im Rotbuchenholz (Fagus syhatica L.).
- Authors
Jayme, Georg; Azzola, Friedrich Karl
- Abstract
Almost all the cells transferred from the cambium layer to the xylem receive a signal of a nature unknown to date. In the case of broadleaved trees they take on the form of libriform fibers or vessels. Besides, intermediate forms have been observed which can be characterized äs fiber tracheids, tracheids, or vascular tracheids. The tracheids of beech wood are only present in a volume percentage of 0.4--1.2%. They are thin-walled, have many pits, and gradually taper towards the ends. In most cases the slit-like pores of the pits form an angle of 45° to the longitudinal axis of the tracheid. The tracheids often carry two small areas of scalariform perforations, the slits of which are arranged perpendicular to the longitudinal axes of the cells. The more the cell takes on the form of a vessel the more these scalariform perforations are replaced by simple ones. At the same time the lumina in the middlepart of the cells enlarge without the extension-growths. As the libriform character of the cell becomes more pronounced, the number of pits becomes less. They arrange themselves into two or three rows, and their slits are aligned longitudinally. In dried pulps the striations of the tracheids due to shrinkage lie parallel to the longitudinal axis since the shrinking secondary wall II during the drying process forces its own deformation upon the whole cell. The pit membranes show the texture of the primary wall and do not possess any tori. Der Arbeitsgemeinschaft Industrieller Forschungsvereinigungen möchten wir auch an dieser Stelle für die einem von uns (A.) gewährte Unterstützung unseren aufrichtigen Dank aussprechen.
- Publication
Holzforschung: International Journal of the Biology, Chemistry, Physics, & Technology of Wood, 1964, Vol 18, Issue 1/2, p9
- ISSN
0018-3830
- Publication type
Article