By Dorothy Catling, John Grayson
It is usually attainable to spot fragments of crops via learning their microscopical features. the popularity of a unmarried characteristic very infrequently establishes the plant's identification; extra frequently, it is important to acknowledge a distinct mix of characteris tics. For plant id, the main helpful features are these least more likely to be stricken by adjustments in atmosphere; if the characteristic is unusual in addition to sturdy, it truly is much more priceless. solid descriptions of the anatomy of crops are worthwhile. for instance, The Identifi cation of Hardwoods (Brazier and Franklin, 1961), including its punched card key, is a wonderful booklet that's necessary in perform. Characters describing the sc1erenchyma account for less than 3 areas during this key. utilizing in simple terms those characters, it might be very unlikely to spot a bushes. Is it attainable then, to spot a species given in basic terms sc1erenchyma within the kind of a advertisement fibre? whether it is attainable, it isn't effortless. even if, for plenty of reasons, plant fibres are being changed by way of man-made fibres, vegetable fibres are nonetheless used, fairly in sacking and cordage and in a few indus trial fabrics. Articles which needs to be tested in a forensic technology laboratory usually are not continuously of modern manufacture and archaeologists and historians have an interest in older fabrics. for this reason, it's nonetheless beneficial for plenty of staff to spot the plant species from which fibres were extracted.
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Extra info for Identification of Vegetable Fibres
Sample text
The lumen is often of uneven width but the appearance is not similar to the variation seen in jute, kenaf or roselle. Elongated slit-like pits are seen, although, like other features, the pits are sometimes obscured by the striations of the wall. Sometimes the apertures of the pits coalesce. DISLOCATIONS AND CROSS MARKINGS Dislocations occur very frequently. There are many cross markings but it is not always easy to see them because the cell wall is uneven. In macerated specimens very fine marks made by parenchyma cells and often, also, the remains of cells are found on fibre cells.
The leaves, which arise from the bole of the plant in a close rosette, are triangular in cross section, but become thinner and more flattened towards the tip which generally bears a terminal spine; some varieties also have lateral spines. Plants of the genus Agave flower only once. Towards the end of its life, the plant produces a flower spike which grows rapidly, sometimes to a height of 10 m. The 51 52 Identification of Vegetable Fibres flowers do not always produce viable seeds, but, in the axils of the peduncles, small bulbils arise which develop into new individuals and, eventually, fall to the ground and take root.
The same authors have reported the occurrence of bundles which are composed of sclerenchyma and phloem or sclerenchyma only, but such bundles have not been found in the sections examined in the course of this work. APPEARANCE AND TEXTURE Sisal is slightly more coarse and slightly more variable than abaca. Its colour varies from white or yellow to brown often tinged with pink. It has a faint lustre. FIBRE CELL ENDS The ends of the fibre cells are generally tapering and rounded; in cells which taper only gradually, they appear rounded.