. Studies in fossil botany . Paleobotany. HETERANGIUM 4°3 formed by the decurrent bases of the spirally arranged leaf-stalks (Fig. 154). The general character of the foliage is known ; the leaves, like those of Lygino- dendron oldhamium, were highly compound, and are referable to the Sphenopteris type (cf. Fig. 160). There is, in fact, good evidence for the identification of Heter-. FlG. i^.—Hcterangium Grievii. Restoration of a portion of the stem, showing trans- verse and longitudinal section, and part of the external surface, .r, primary wood of stele ; -r2, secondary wood ; pc, phloem and
. Studies in fossil botany . Paleobotany. HETERANGIUM 4°3 formed by the decurrent bases of the spirally arranged leaf-stalks (Fig. 154). The general character of the foliage is known ; the leaves, like those of Lygino- dendron oldhamium, were highly compound, and are referable to the Sphenopteris type (cf. Fig. 160). There is, in fact, good evidence for the identification of Heter-. FlG. i^.—Hcterangium Grievii. Restoration of a portion of the stem, showing trans- verse and longitudinal section, and part of the external surface, .r, primary wood of stele ; -r2, secondary wood ; pc, phloem and pericycle (left blank) ; c, cortex, with horizontal sclerotic bands ; liy, hypoderma of stem and petiole; , leaf-traces, one of which is entering the petiole ; r, adventitious root. The bases of several petioles are shown. Enlarged. After Williamson, Phil. Trans. angium Grievii with a definite species of Sphenopteris, but before entering into this question it will be necessary to describe the organisation of the specimens with structure preserved. 1. The Stem (H. Grievii).—The stem of Heteran- gium, like that of Lyginodendron, had a single vascular 27. 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonaandcblack
