An Introduction to Paleobotany by Chester A. Arnold

By Chester A. Arnold

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Plant part may be so close as to deceive at least temporarily even the Remains of graptolites and the " pinnules " professional paleobotanist. of some crinoids, as Botrycrinus, have been misinterpreted as Devonian The organism named Psilophyton Hedei, from or pre-Devonian plants. the Silurian of the island of Gotland, and once figured as the oldest example of a land plant, is now thought to be an animal closely related to the graptolites. Other examples of a similar nature could be cited. A cavity in a piece of rock from Greenland, long supposed to be a palm fruit, is now thought to be the footprint of some ancient animal.

Bodies of both consist of several layers of heavily cutiriized and within the tissue of the cutinizcd spores are cells, body borne in tetrads. (B) (A) Fid. 20. (A) Foerstia ohioensis. from photograph by White. X Drawn about 10. Sporocarpon and Foerstia arc found in the Upper Devonian black shales of Kentucky and OHio. Although their affinities X about 10. are unknown, they are similar in appearance to certain modern brown algae that inhabit the zone between the tides, but being cutinized were able to withstand longer exposure to Differ in the dry air.

The form known as Sporocarpon furcatum is slightly unequally two-lobed and different (Fig. somewhat resembles the pincher of a lobster. Foerstia ohioensis similar but the longer of the sometimes lobes like a curves is two inward The shepherd's crosier. bodies of both consist of several layers of heavily cutiriized and within the tissue of the cutinizcd spores are cells, body borne in tetrads. (B) (A) Fid. 20. (A) Foerstia ohioensis. from photograph by White. X Drawn about 10. Sporocarpon and Foerstia arc found in the Upper Devonian black shales of Kentucky and OHio.

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