. Studies in fossil botany . Paleobotany. 28o STUDIES IN FOSSIL BOTANY. Fig. iog.—Group of Palaeozoic fructifications of Ferns or Pteridosperms. A. Asterotheca (probably Marattiaceous). i. Fertile pinnule showing eight synangia. Enlarged. 2. Synangium in side-view ; 3. in section (diagrammatic). After Stur. B. Renauitia, Zeiller (affinities doubtful). 1- Pinnule, showing sporangia on veins. Nat. size. 2. Single sporangium. Enlarged. After Zeiller. C. Dactylotkeca (affinities doubtful). 1. Pinnule, showing sporangia on veins. Nat. size. 2. Single sporangium. Enlarged. After Zeiller. D. SUi-riel
. Studies in fossil botany . Paleobotany. 28o STUDIES IN FOSSIL BOTANY. Fig. iog.—Group of Palaeozoic fructifications of Ferns or Pteridosperms. A. Asterotheca (probably Marattiaceous). i. Fertile pinnule showing eight synangia. Enlarged. 2. Synangium in side-view ; 3. in section (diagrammatic). After Stur. B. Renauitia, Zeiller (affinities doubtful). 1- Pinnule, showing sporangia on veins. Nat. size. 2. Single sporangium. Enlarged. After Zeiller. C. Dactylotkeca (affinities doubtful). 1. Pinnule, showing sporangia on veins. Nat. size. 2. Single sporangium. Enlarged. After Zeiller. D. SUi-riella, Weiss (cf. Corynej>teris). Transverse section of pinnule, showing a synangium. a, vascular bundle of pinnule ; c, hairs ; b, d, annulus of confluent sporangia. X 8. After Renault. E. Oligocarfiia (cf. Gleicheniaceae). Sorus in surface-view. Magnified. After Stur. F. Crossotheca (<5 of Lyginodendreae). Fertile pinna, bearing several pinnules with sporangia. Enlarged. After Zeiller. G. Senftenbergia (cf. Schizaeaceae). Tip of fertile pinnule, showing five annulate sporangia. Magnified. After Renault. H. Hawlea (probably Marattiaceous). Synangium, after dehiscence of the sporangia. Magnified. After Stur. J. Umatopteris (affinities doubtful). 1 Part of fertile pinna. Nat. size. 2. Sporangia, enlarged, showing apical pores. After 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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