Flora Europaea, Vol. 4: Plantaginaceae to Compositae (and by T. G. Tutin, V. H. Heywood, N. A. Burges, D. H. Valentine

By T. G. Tutin, V. H. Heywood, N. A. Burges, D. H. Valentine

Initially released among 1964 and 1980, this fourth quantity is a revision of the 7th variation of Willis, with giant amendments and additions. One specific function is an alphabetical record of accredited kin names during this dictionary with their equivalents in Bentham & Hooker's Genera Plantarum and Engler's Syllabus.

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Plate 20B. Enlarged portion of plate 20A, showing the interface between the generative cell and the vegetative cell of Euphorbia dulcis L.. During the detachment of the generative cell from the intine, the morphology of the wall in between the two cells changes. The two plasma membranes become very straight and positioned very closely to each other. The generative cell develops a cytoskeleton of which the micro tubules near the plasma membrane are very evident (arrows). x 60,000. (Plates 20 A,B courtesy M Murgia, Siena).

X 20,000. (Plates 18A, C reproduced by permission from Van Went J (1984) Theor Appl Genet 68: 305-309). 52 53 ANTHER DEVELOPMENT - Generative cell formation Generative -\H-cell --+~J---+_Vegetative cell Plate 19. , just after its formation. The newly formed generative cell is lenticularly shaped and attached to the intine. It is much smaller than the vegetative cell, because of the unequal division of the microspore. The generative cell has only few organelles and no plastids, as a result of the clustering of most organelles and all plastids during the microspore division in such a position that they are directly transferred to the vegetative cell.

In the cytoplasmic male sterile anther, vacuolation of the microspores is apparently blocked. In the cytoplasm large quantities of membranes are formed, which develop into large aggregates (asterisk). x 12,000. (Original J Van Went). Microspore of Impatiens walleriana Hook f. at the onset of mitosis. After its release from the tetrad the microspore enlarges, which is accompanied by the formation of vacuoles, and the thickening of the exine. At the onset of mitosis the microspore nucleus takes an acentral position in the mid region of the microspore.

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