. Studies in fossil botany . Paleobotany. Fig. 108.—Ptychocarjms unitus. Fructification. A. Part of a fertile pinnule (lower sur- face), showing numerous synangia. R. Synangia in side-view. A and B X about 6. After Grand'Eury. C. A synangium, in section parallel to the surface of the leaf, showing seven confluent sporangia, a, bundle of receptacle ; b, its parenchyma ; c tapetum ; d, spores; c,f, common envelope of synangium. X about 60. After Renault. face of each sporangium. In the fossil genus there is no central depression, and, as the entire synangium was embedded in a continuous envelopi
. Studies in fossil botany . Paleobotany. Fig. 108.—Ptychocarjms unitus. Fructification. A. Part of a fertile pinnule (lower sur- face), showing numerous synangia. R. Synangia in side-view. A and B X about 6. After Grand'Eury. C. A synangium, in section parallel to the surface of the leaf, showing seven confluent sporangia, a, bundle of receptacle ; b, its parenchyma ; c tapetum ; d, spores; c,f, common envelope of synangium. X about 60. After Renault. face of each sporangium. In the fossil genus there is no central depression, and, as the entire synangium was embedded in a continuous enveloping tissue, de- hiscence could only have taken place at the 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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