Fig. 2. Franhueberia gerriennei gen. et sp. nov. (USNM 558725). (A) Transverse section of axis; primary xylem at center, surrounded by secondary xylem. Slide B21 E b no. 106. Scale = 300 μ m. (B) Radial longitudinal section; primary xylem at center (arrows); asterisk indicates same position as in C. Slide B21 E(2) s no. 42A. Scale = 100 μ m. (C) Detail of B (asterisk indicates same position as in B). Primary xylem longitudinal section; protoxylem tracheid with annular-helical thickening (at left, next to asterisk) and metaxylem tracheids with circular and oval bordered pits. Note tracheids with continuous secondary wall lining interrupted by sparse pitting (right of protoxylem tracheid); oval pits with two apertures per membrane close to the upward tapering end of a metaxylem tracheid (arrowhead); and metaxylem tracheid with scalariform multiaperturate pits (right). Scale = 40 μ m. (D) Transverse section; primary xylem at center, with no particular patterning of tracheids (and with taphonomically induced compression and fracturing) surrounded by secondary xylem exhibiting radial patterning of tracheids.