Trees a Handbook of Forest Botany for the Woodlands And the Laboratory volume
Trees a Handbook of Forest Botany for the Woodlands And the Laboratory volume
H Marshall Harry Marshall Ward
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Sometimes they are expanded above into plate-like discs, or scales, and the silvery lustre or coppery metallic sheen of the twigs or buds of Hippophae and Elceagnus are due to the reflection of the broken light playing on such scales (Fig. 55). In other cases the hairs are swollen at their ends into little rounded heads containing semi-fluid, sticky excre- tions, usually composed of resinous or gummy substances. Such glandular hairs occur on the young shoots of the Hazel and species of Ribes, R...osa, &c. , the flower-buds of Azalea, the bud-scales of Horse-chestnut, &c. But in most cases the hairs are simple, or occasionally branched filamentous structures containing nothing but air, and in the mass appearing white by reflected light, or, if not sufficiently long and numerous to reflect much light, modifying the smoothness and colour of the twig or bud in other ways ; occasionally these hairs are coloured, and the hue of the twig, &c. , is altered accordingly, e. G. 126 PUBESCENCE, ETC.
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