. Fossil plants : for students of botany and geology . Paleobotany. IV] FOSSIL PLANTS IN VOLCANIC ASH. 89 petrified plants of Carboniferous age occur in such preservation as allows of a minute investigation of their internal structure. The occurrence of plants in the former locality was first discovered by Mr Wiinsch of Glasgow; the fossils occur in association with hardened shales and beds of ash, and are often exceedingly well preserved^ In fig. 18 is reproduced a sketch of a hollow tree trunk from Arran, probably a Lepidodendron stem, in which only the outer portion of the bark has been pre
. Fossil plants : for students of botany and geology . Paleobotany. IV] FOSSIL PLANTS IN VOLCANIC ASH. 89 petrified plants of Carboniferous age occur in such preservation as allows of a minute investigation of their internal structure. The occurrence of plants in the former locality was first discovered by Mr Wiinsch of Glasgow; the fossils occur in association with hardened shales and beds of ash, and are often exceedingly well preserved^ In fig. 18 is reproduced a sketch of a hollow tree trunk from Arran, probably a Lepidodendron stem, in which only the outer portion of the bark has been preserved, while the inner cortical tissues have been removed and the space occupied by volcanic detritus. The smaller cylindrical structures in the interior of the hollow trunk are the central woody cylinders of Lepidodendroid trees; each consists of an axial pith surrounded by a band. Fio. 18. Diagrammatic sketch of a slab cut from a fossil stem {Lepidodendron ?) from Laggan Bay. e, Imperfectly preserved bark of a large stem, extending in patches round the periphery of the specimen ; the oval and circular bodies in the interior are the xylem portions of the central cylinders of Lepidoden- dron stems, x\ primary wood, x^, secondary wood. From a specimen in the Biuney collection, Woodwardian Museum, Cambridge. I nat. size. of primary wood and a broader zone of secondary wood. One of the axes probably belonged to the stem of which only the shell has been preserved, the others must have come from other 1 Bryoe (72) p. 126, fig. 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
