Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 FIG. 90. Two pollen-masses (pollinia) joined by their bands (retinacula) to their central body (corpusculum). The frag- ment hanging down from the central body between these two pollen-masses is part of a leg of an insect which had been caught in the wedge-shaped slit in this body, and which had liberated itself by breaking off and leav- ing part of its leg fast there- in. Greatly enlarged. Photo- graphed by \V. C. Stevens. Fin. 89. Longitudinal section of milkweed, a, corpusculum ; <7, sl
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 FIG. 90. Two pollen-masses (pollinia) joined by their bands (retinacula) to their central body (corpusculum). The frag- ment hanging down from the central body between these two pollen-masses is part of a leg of an insect which had been caught in the wedge-shaped slit in this body, and which had liberated itself by breaking off and leav- ing part of its leg fast there- in. Greatly enlarged. Photo- graphed by \V. C. Stevens. Fin. 89. Longitudinal section of milkweed, a, corpusculum ; <7, slit between anthers; n, pollen-mass (polliniuin) in normal position within flower. ont perpendicularly as a slight triangular membranous expan- sion. Each anther bears two pollen-masses. Each of these masses is called a pollinmm. Hands or retinacula unite each polliniuin, to a dark central body, the corpusculum, situated at the top of the slit. The cor- pusculum is hard, horny, and upon examination is found to he grooved longitudinally. (Fig. DO.) This wedge-shaped iM'oove lies in line with the slit between the anthers. The lower part of the slit between the anthers is wider, and leads up into tin1 so-called stigmatic
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