. Studies in fossil botany . Paleobotany. 536 STUDIES IN FOSSIL BOTANY flower, with a central superior gynsecium, a whorl of hypogynous stamens, and an enveloping perianth. The anatomical structure of the microsporophylls has not yet been fully investigated, but it is known that two ranks of vascular bundles are present in the connate disc, and that a considerable number. Fig. cio.—Cyca'ieoidca dacotensis.—Transverse section through rachis of a sporo- phyll and adjacent synangia. The middle and lower synangia are cut transversely, the upper very obliquely. The palisade-layer, walls of the locu
. Studies in fossil botany . Paleobotany. 536 STUDIES IN FOSSIL BOTANY flower, with a central superior gynsecium, a whorl of hypogynous stamens, and an enveloping perianth. The anatomical structure of the microsporophylls has not yet been fully investigated, but it is known that two ranks of vascular bundles are present in the connate disc, and that a considerable number. Fig. cio.—Cyca'ieoidca dacotensis.—Transverse section through rachis of a sporo- phyll and adjacent synangia. The middle and lower synangia are cut transversely, the upper very obliquely. The palisade-layer, walls of the loculi, and spores are all shown. X about 2s. From Wieland. enter each rachis as it becomes free. The general arrangement of the bundles is compared with that in the rachis of a Cycad leaf. The synangia, as already mentioned, are inserted in two rows on each pinna ; their insertion is described by Dr. Wieland as "; Such a position is common on the modified fertile fronds of Ferns, where the insertion of the sporangia on the lower surface, usual. 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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