. Fossil plants : for students of botany and geology . Paleobotany. xxv] BOTRYOPTERIS 441 stage in subdivision. At sp in fig. A the section has cut through a single sporangium characterised by a group of larger (" annulus ") cells on one side of the wall.. C D Fig. 306. A—D. Botri/opteris ramosa; stem and frond axes. (Ax 7; Bxl.5; Cx26; D X13. From sections in the Cambridge Botany School Collection.) p.r, protoxylem; sp, sporangium; e, epidermis. This slender fern with its numerous repeatedly branched leaves may perhaps have lived epiphytically on more robust plants.. Please note tha

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. Fossil plants : for students of botany and geology . Paleobotany. xxv] BOTRYOPTERIS 441 stage in subdivision. At sp in fig. A the section has cut through a single sporangium characterised by a group of larger (" annulus ") cells on one side of the wall.. C D Fig. 306. A—D. Botri/opteris ramosa; stem and frond axes. (Ax 7; Bxl.5; Cx26; D X13. From sections in the Cambridge Botany School Collection.) p.r, protoxylem; sp, sporangium; e, epidermis. This slender fern with its numerous repeatedly branched leaves may perhaps have lived epiphytically on more robust plants.. 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