Fig. 2. The effects of exogenous auxin in wild type. (A) A gametophore cultured in 1 µM NAA for a week with adventitious gametophore (white arrow). (B) The uppermost mid-stem rhizoid of the gametophore (white arrow) in A. The black arrow indicates a midrib. (C-E) Gametophores grown with 0.1 (C), 1.0 (D), and 10 (E) µM NAA for 6 weeks. The positions of the transverse sections in F-I is indicated by the lines. The asterisks and arrows in F and G indicate rhizoids and cells of the leaf traces, respectively. Scale bars: in A, 1 mm for A; in C, 1 mm for C-E; in B, 100 µm for B; in F, 100 µm for F-I.