. Fossil plants : for students of botany and geology . Paleobotany. xx] GLEICHENIACEAE 289 semi-circular in form (fig. 226, C), in others (sect. Mertensia') the segments are linear (fig. 226, D), and in many species the fronds are distinguished by the regular dichotomous branching. Fio. 224. A. Aneimia flexuosa. B. A. phyllitidis. C. Hymeiwphyllum dilatatum. D. E, F, G. Matonia pectinata; i, indusium. H. Thyrsopteris elegans. I. Gleichenia circinata. (A, B, after Prantl; C, G, H, I, after Bower.) 1 Underwood (07), p. 243, has adopted Bernhardi's genus Dicranopteria in place of Mertensia on the

. Fossil plants : for students of botany and geology . Paleobotany. xx] GLEICHENIACEAE 289 semi-circular in form (fig. 226, C), in others (sect. Mertensia') the segments are linear (fig. 226, D), and in many species the fronds are distinguished by the regular dichotomous branching. Fio. 224. A. Aneimia flexuosa. B. A. phyllitidis. C. Hymeiwphyllum dilatatum. D. E, F, G. Matonia pectinata; i, indusium. H. Thyrsopteris elegans. I. Gleichenia circinata. (A, B, after Prantl; C, G, H, I, after Bower.) 1 Underwood (07), p. 243, has adopted Bernhardi's genus Dicranopteria in place of Mertensia on the Stock Photo
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. Fossil plants : for students of botany and geology . Paleobotany. xx] GLEICHENIACEAE 289 semi-circular in form (fig. 226, C), in others (sect. Mertensia') the segments are linear (fig. 226, D), and in many species the fronds are distinguished by the regular dichotomous branching. Fio. 224. A. Aneimia flexuosa. B. A. phyllitidis. C. Hymeiwphyllum dilatatum. D. E, F, G. Matonia pectinata; i, indusium. H. Thyrsopteris elegans. I. Gleichenia circinata. (A, B, after Prantl; C, G, H, I, after Bower.) 1 Underwood (07), p. 243, has adopted Bernhardi's genus Dicranopteria in place of Mertensia on the ground that the latter was used as early as 1793 for a Boraginaceous plant.. 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 work.. Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press