. Fossil plants : for students of botany and geology . Paleobotany. 364 CALAMITES. [CH. single layer of cells (fig. 95, B) which present a characteristic appearance in surface-view (fig. 95, C), the thin walls being. A. B. G. D. Fig. 95. Calamostachys Binneyana (Carr.). A aporangiophore and one sporangium, t, vascular bundle, x 45. Tangential section showing portions of two sterile discs, 6, 6; a sporan- giophore, a, with its four sporangia, in two of which are seen the spores; t, vascular bundle, x 35. Surface-view of cells of a sporangium wall, x 130. Spores and remains of mother-cells, x 13
. Fossil plants : for students of botany and geology . Paleobotany. 364 CALAMITES. [CH. single layer of cells (fig. 95, B) which present a characteristic appearance in surface-view (fig. 95, C), the thin walls being. A. B. G. D. Fig. 95. Calamostachys Binneyana (Carr.). A aporangiophore and one sporangium, t, vascular bundle, x 45. Tangential section showing portions of two sterile discs, 6, 6; a sporan- giophore, a, with its four sporangia, in two of which are seen the spores; t, vascular bundle, x 35. Surface-view of cells of a sporangium wall, x 130. Spores and remains of mother-cells, x 130. (After "Williamson and Scott.) crossed at right angles by small vertical plates. In the tangential section of the coherent sterile whorls (fig. 95, B, b and b) the vascular strands are occasionally seen in transverse section (fig. 95, B, t), as they pass outwards to the several fi-ee bracts. The spores in Calamostachys Binneyana are all of the same size, and no macrospores have ever been seen. In well pre- served specimens tetrads of spores may be seen, still enclosed by the wall of the spore-mother-cell (fig. 95, A and D); and the torn remnants of the mother-cell sometimes simulate in appearance the elaters of an Equisetum spore. In surface-view a spore often shows clearly the three-rayed marking, which is a charac- teristic feature of daughter-cells formed in a tetrad from a. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
