. Fossil plants : for students of botany and geology . Paleobotany. 18 PSILOTALES [CH. Sw. (fig. 118) and P. complanatum Sw., flourishes in moist tropical regions of both hemispheres, growing either on soil rich in organic substances or as an epiphyte. Both genera are considered to be more or less Fig. 118. Psilotum triquetrum (J natural size). A. Synangium. B. Sporophyll after removal of the synangium. () Psilotum. The common tropical species P. triquetrum (fig. 118) is characterised by an underground rhizome which forms a confused mass of dark brown branches covered with fi
. Fossil plants : for students of botany and geology . Paleobotany. 18 PSILOTALES [CH. Sw. (fig. 118) and P. complanatum Sw., flourishes in moist tropical regions of both hemispheres, growing either on soil rich in organic substances or as an epiphyte. Both genera are considered to be more or less Fig. 118. Psilotum triquetrum (J natural size). A. Synangium. B. Sporophyll after removal of the synangium. () Psilotum. The common tropical species P. triquetrum (fig. 118) is characterised by an underground rhizome which forms a confused mass of dark brown branches covered with filamentous hairs as substitutes for roots and gives off erect repeatedly forked aerial shoots. In P. complanatum^ the habit 1 Baker (87) A. p. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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