. Fossil plants : for students of botany and geology . Paleobotany. 174 THALLOPHYTA. [CH. Biplopora. Fig. 35, A and B. This genus of algae is characteristic of Triassic rocks, and is especially abundant in Muschelkalk and Lower Keuper lime- stones of the Alps, Silesia, and elsewhere. The thallus, or rather the calcareous portion of the thallus, has the form of a thick-walled tube, with a diameter of about 4 mm., and occasionally reaching a length of 50 mm. At one end the tube has a rounded and closed termination, and the wall is pierced throughout its whole length by regular whorls of fine can
. Fossil plants : for students of botany and geology . Paleobotany. 174 THALLOPHYTA. [CH. Biplopora. Fig. 35, A and B. This genus of algae is characteristic of Triassic rocks, and is especially abundant in Muschelkalk and Lower Keuper lime- stones of the Alps, Silesia, and elsewhere. The thallus, or rather the calcareous portion of the thallus, has the form of a thick-walled tube, with a diameter of about 4 mm., and occasionally reaching a length of 50 mm. At one end the tube has a rounded and closed termination, and the wall is pierced throughout its whole length by regular whorls of fine canals. Biplopora agrees with Cymopolia in its main features. Fig. 35, A, affords a diagrammatic view of a Biplopora tube, and shews the arrangement of the numerous whorls of canals. In fig. 35, B, a piece of limestone is represented containing several Diploporas cut across transversely and more or less. 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
