. Botanical gazette. Plants. BOTANICAL GAZETTE. 2R1 The foliar noctar glands ofPopiilns: by Wm. Treleasc— Early in May, t8So, my attention was drawn to a small nsi)en (/'. trciiiuloidcs) by the actions of several green bees, belonging to the species known as Auf;oc/i/ora pura. At this time the tree was covered with newly expanded foliage; and the bees, flying busily from leaf t« leaf, were evidently at tracted by something and a moment's observation Ml sufficed to show that they were engaged in collect- ing nectar, secreted by a double gland at the base of each leaf. Theseglands were placed on
. Botanical gazette. Plants. BOTANICAL GAZETTE. 2R1 The foliar noctar glands ofPopiilns: by Wm. Treleasc— Early in May, t8So, my attention was drawn to a small nsi)en (/'. trciiiuloidcs) by the actions of several green bees, belonging to the species known as Auf;oc/i/ora pura. At this time the tree was covered with newly expanded foliage; and the bees, flying busily from leaf t« leaf, were evidently at tracted by something and a moment's observation Ml sufficed to show that they were engaged in collect- ing nectar, secreted by a double gland at the base of each leaf. Theseglands were placed on the uj)- per surface of the petiole (Fig. 6) at its union with the blade, appearing, in- deed, almost as if the petiole projecting above the upper surface of the blade had been abruiJtly cut down to the level of the latter, the truncated end being the secreting portion of the g'and. Longitudinal sections of the glands showed them to have the structure us- ually found in members of the sort: the epidermis was transformed into a double layer of thin- walled elongated cells, forming the secreting sur- face just mentioned; and these cells, as well as the subjacent parenchyma, were charged with saccharine fluids. The homology of the glands, however, was not so readily determined. Each was more or less deeply bilobed and plainly consisted of two confluent glands, and from their similarity, in point of situation,to the Explanation of fkuiurs.—Fig. 1. Quadrifid gland from base of loaf of r^ypnhiK tremulii, vur. peiuli/la, enlarged. Fig. 2. Glands from the sumo plant,borne upon the leaf-margin, enlarged. Fig. 8. Branched glands from P. moiiiliferd, enlar,u;ed. Fig. 4. Base of leat of P. momlifei'it having one glaiid displaced and borne on the margin, enlarged. Fig. 5. Base of loaf of y\ ^/•iV7ww//'Drt, showing the gradation ofpeliolar into serration glands, natural size. Fig. 0. Leaf of/'.//rw;*//«?V/cs, showinii-the ordinar}- form of lli<'double gland, natural Please
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