. The geological history of plants. Paleobotany; 1888. 62 THE GEOLOGICAL fflSTORT OF PLANTS. abundant, in the Carboniferous. Many years ago I ob- served, in a beautiful specimen collected by Sir W. E. Logan, in New Brunswick, that the stem of this plant had an axis of reticulated and scalariform vessels, and an outer bark.* Eenault and Williamson have more recently obtained more perfect specimens, and the former has figured a remarkably complex triangular axis,-containing punctate and barred vessels, and larger punctate vessels filling in its angles. Outside of this there is a cellular inner b
. The geological history of plants. Paleobotany; 1888. 62 THE GEOLOGICAL fflSTORT OF PLANTS. abundant, in the Carboniferous. Many years ago I ob- served, in a beautiful specimen collected by Sir W. E. Logan, in New Brunswick, that the stem of this plant had an axis of reticulated and scalariform vessels, and an outer bark.* Eenault and Williamson have more recently obtained more perfect specimens, and the former has figured a remarkably complex triangular axis,-containing punctate and barred vessels, and larger punctate vessels filling in its angles. Outside of this there is a cellular inner bark, and this is surrounded by a thick fibrous en- velope. That a structure so complex should belong to a plant so humble in its affinities is one of the strange anomalies presented by the old world, and of which we shall find many similar instances. The fruit of Spheno- pTiyllum was borne in spikes, with little whorls of bracts or rudimentary leaves bearing round Fio. 17.—. '•on plumosum (Lower Carboniferous, Nova Scotia). Natural size and raugnified. A second type of plant, which may have been Ehizo- carpean in its affinities, is that to which I have given the name Ptilopliyton.\ It consists of beautiful feathery * " Journal of the Geological Society," 1865. f Plumcdina of 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 Dawson, John William, Sir, 1820-1899. New York, D. Appleton and Company
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