Handbook of practical botany for the botanical laboratory and private student (1908)
Strasburger, Eduard, 1844-1912, Hillhouse, William, 1850-1910 · London, S. Sonnenschein; New York, Macmillan · leaf 421
mpare fern sporangia,p. 356). In the pollen-sac of Pmus, on the other hand, the epi-dermis showed the characteristic thickening ridges, as also withthe sporangial wall of Lycopodiaceae ; in these cases, therefore,the epidermis plays the mechanical part in dehiscence. Development of the Pollen and… … 140, C, e), of two or three layers of flat (/, c), and one layerof radially-elongated cells (t), the former the meso- and endo- thecium, thelatter the tape-t a 1 layer.These last sur-round the entiresac. The in-terior is filledwith polygonalpollen mother-cells, still co-hering.—If wenext…
Botany · Plant physiology · Microscopy
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