Abstract
ABSTRACT The protoplasmic structures described in the following communication are connected with the glandular hairs or trichomes found on both surfaces of the leaf of the common teasel, Dipsacus sylvestris. The trichomes are of two kinds, differing in a marked manner and shape. The form of gland from which alone the protoplasmic filaments issue is shown in the diagram. The gland consists of a multicellular pear-shaped head, supported on a cylindrical unicellular stalk which rests on a projecting epidermic cell. The whole structure projects about of a millimeter ( inch) above the surface of the leaf.
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