. Fossil plants : for students of botany and geology . Paleobotany. XXIl] DACTYLOTHECA 405 pinnae are subtended by two Aphlebiae (fig. 293, A) appressed to the rachis, like the delicate leaves of the recent fern Tera- tophyllum aculeatum (see page 301). The sporangia (0"5—0"65) are oval and exannulate and are attached parallel to the lateral veins; they may occupy the whole of the space between the midrib and the edge of the pinnules. This species occurs in the Upper, Middle, and Lower Coal-Measures of Britain, reaching. "^ ^ftJ^QA. Fig. 292. Dactylothecaplmnosa. (After Kidston.
. Fossil plants : for students of botany and geology . Paleobotany. XXIl] DACTYLOTHECA 405 pinnae are subtended by two Aphlebiae (fig. 293, A) appressed to the rachis, like the delicate leaves of the recent fern Tera- tophyllum aculeatum (see page 301). The sporangia (0"5—0"65) are oval and exannulate and are attached parallel to the lateral veins; they may occupy the whole of the space between the midrib and the edge of the pinnules. This species occurs in the Upper, Middle, and Lower Coal-Measures of Britain, reaching. "^ ^ftJ^QA. Fig. 292. Dactylothecaplmnosa. (After Kidston. Slightly reduced.) its maximum in the Upper Coal-Measures. The aphlebiae undoubtedly served to protect the young fronds, as shown by a specimen figured by Kidston (fig. 293, B); they may also have served other purposes, as suggested by the above comparison with Teratophylluni, in the mature frond. Lindley and Hutton regarded the aphlebiae as leaves of a fern climbing up 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
