. Dudley memorial volume, containing a paper by William Russel Dudley and appreciations and contributions in his memory by friends and colleagues ... Dudley, William Russel, 1849-1911; Botany. 56 DUDLEY MEMORIAL VOLUME The seta at this stage has about the same length as the capsule, and in longitudinal section (Fig. 12, H) shows the cells to be arranged in pretty regular rows. Probably the great elongation of the seta at the time the spores are shed is due to simple elongation of the cells without any cell divi- sions, as has been shown to be the case in other liverworts. The large heart- shap
. Dudley memorial volume, containing a paper by William Russel Dudley and appreciations and contributions in his memory by friends and colleagues ... Dudley, William Russel, 1849-1911; Botany. 56 DUDLEY MEMORIAL VOLUME The seta at this stage has about the same length as the capsule, and in longitudinal section (Fig. 12, H) shows the cells to be arranged in pretty regular rows. Probably the great elongation of the seta at the time the spores are shed is due to simple elongation of the cells without any cell divi- sions, as has been shown to be the case in other liverworts. The large heart- shaped foot (f) is composed of somewhat irregular cells showing no defi- nite Fig. 11. Spore division. A, spore mother cell, shewing the quadripolar spindle, X 750. B, three spore mother cells of about the same age, showing the different arrangement of the lobes of the cell, x about 350. C, young elater. D, spore mother cell, sho>ving the chromosomes. E, a somewhat earlier stage. F-I, successive stages of mitosis with quadripolar spindle. In G and H the chromosomes only are shown. /, mother cell with the lobes in pairs; there are two nuclear spindles at right angles to each other. K, mother cell, showing a bi-polar spindle at the first mitosis. L, first mitosis, showing two nuclei separated by a distinct cell-plate, x about 400. M, mother cell just before the final separation of the spores, x 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 Stanford University, Cal. , The University
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
