. Studies in fossil botany . Paleobotany. 56 STUDIES IN FOSSIL BOTANY •practically identical with the homosporous species C. Binneyana, the differences between them being of a trivial kind. In some of the sporangia, however, numerous small spores are contained—slightly smaller than those c. Fig. 22.—Calamostachys Binneyci7ia. A single sporangiumj containing spores in tetrads. Many of the spores are abortive (£). The structure of the sporangial wall is well shown. X ioo. A. Tetrad with all four spores about equal. B, C. Tetrads, each with one abortive spore. D. Ripe spores showing the triradiat
. Studies in fossil botany . Paleobotany. 56 STUDIES IN FOSSIL BOTANY •practically identical with the homosporous species C. Binneyana, the differences between them being of a trivial kind. In some of the sporangia, however, numerous small spores are contained—slightly smaller than those c. Fig. 22.—Calamostachys Binneyci7ia. A single sporangiumj containing spores in tetrads. Many of the spores are abortive (£). The structure of the sporangial wall is well shown. X ioo. A. Tetrad with all four spores about equal. B, C. Tetrads, each with one abortive spore. D. Ripe spores showing the triradiate marks. A-D X 200. Phil. Trans., W. and S. Will. Coll. 1011, etc. of C. Binneyana, while other sporangia on the same cone, and sometimes on the same sporangiophore, contain a much smaller number of large spores, the diameter of which is just three times that of the former (see Fig. 23). Here, therefore, we have a perfectly clear case of 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
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