. Studies in fossil botany . Paleobotany. CINGULARIA 69 been the points of attachment of the sporangia, as the latter are occasionally found in situ. Each of the sporangiophores thus bore four sporangia on its lower surface (Fig. 29). The sporangia were of approximately spherical form, and remarkably large, averaging 5 mm. in diameter, which is five times the size of the sporangia of Calamostachys Binneyana. The number of bracts in. Fig. 29.—Cingularia typica. Enlarged diagram of a verticil of the cone, showing the connate bracts (b) above, and the strap-shaped sporangiophores (r) below, beari
. Studies in fossil botany . Paleobotany. CINGULARIA 69 been the points of attachment of the sporangia, as the latter are occasionally found in situ. Each of the sporangiophores thus bore four sporangia on its lower surface (Fig. 29). The sporangia were of approximately spherical form, and remarkably large, averaging 5 mm. in diameter, which is five times the size of the sporangia of Calamostachys Binneyana. The number of bracts in. Fig. 29.—Cingularia typica. Enlarged diagram of a verticil of the cone, showing the connate bracts (b) above, and the strap-shaped sporangiophores (r) below, bearing the sporangia (s). The small figures show two sporangiophores, that on the left seen from above, and that on the right from below. In the middle a sporangium. After Weiss. a whorl seems to have been equal to that of the sporangiophores. The great peculiarity of Cingularia consists in the fact that the sporangiophores lie immediately below the sterile bracts of each whorl, instead of immediately above them, as in the last type. This is different from anything we are accustomed to find among other Pteridophyta. In the absence of better evidence than we at present possess, it is impossible to draw any decisive conclusions as to the. 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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