. A Manual of botany : being an introduction to the study of the structure, physiology, and classification of plants . Botany. Fig. 388. Fig. 389. lit,. "..J. by foldings of these membranes. In some aquatics, as Zostera marina, Zannichellia pedunculata, Naias minor, etc., only one covering exists, Fig. 385. Flower of Asclepias, showing the poUinia or pollen-masses, p, attached to the stigma, and covered by appendages. Fig. 386. Pistil of Asclepias, a, with poUen-masses, p, adhering to the stigma, s. Pollen-masses, removed from the stigma, &, omited by a gland-like body. Fig. 387. Poll
. A Manual of botany : being an introduction to the study of the structure, physiology, and classification of plants . Botany. Fig. 388. Fig. 389. lit,. "..J. by foldings of these membranes. In some aquatics, as Zostera marina, Zannichellia pedunculata, Naias minor, etc., only one covering exists, Fig. 385. Flower of Asclepias, showing the poUinia or pollen-masses, p, attached to the stigma, and covered by appendages. Fig. 386. Pistil of Asclepias, a, with poUen-masses, p, adhering to the stigma, s. Pollen-masses, removed from the stigma, &, omited by a gland-like body. Fig. 387. Pollinia or pollen-masses of orchis, separated from the point above the stigma, with their retinacula or viscid matter attaching them at the base. The pollen- masses, p, are supported on stalks or caudicles, c, with glands at base, g. These masses are easUy detached by the agency of insects. Fig. 388. PoUen-grain of Passiflora before burst- ing. 0 0 0, Opercula or lids formed by the extine, which open to allow the protrusion of the intine in the form of pollen-tubes. Fig. 389. Pollen-grain of Cucurbita Pepo, or Gourd, at the moment of its dehiscence or rupture, o o, Opercula or lids separated from the extine by the protrusion of the pollen-tubes, 11. Fig. 390. Pollen-grain of Ipomcea, with a reticu- lated Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Balfour, John Hutton, 1808-1884. Edinburgh : A. and C. Black
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
