Additional file 1 of Re-study of Guangdedendron micrum from the Late Devonian Xinhang forest

Additional file 1: Fig. S1. Stems and strobili of Guangdedendron micrum from Jianchuan (A–G, I, L–O) and Yongchuan (H, K, P, Q) mines. (A, B) Two sides of a stem with expanded base and leaf cushions. PKUB21005. (C, D) Two sides of a stem. PKUB21006. (E, F) In-situ once-dichotomized stems. Two arrows in Fig. S1E indicating two daughter axes. (G) Oval fissures helically arranged along stem. (H) Oval fissures helically arranged along in-situ stem. (I) Enlargement of portion in Fig. 3R (arrow), showing a ligule pit (Lp) and a vascular bundle scar (Vs). (J) Interpretative line drawing of helically arranged leaf bases according to Fig. 3U, indicating outlines (black lines) and parastichies (red dotted lines) of leaf bases. PKUB16049. (K, L) Dichotomized fertile axes with terminal single strobilus. (M, N) Terminal strobili in pairs. PKUB16097, 16099. (O) Dichotomized fertile axis with partially preserved strobili. (P) Over ten strobili preserved in the same direction. (Q) A possibly once-dichotomized strobilus. Arrow indicating portion enlarged in Fig. 7J. PKUB16064. Scale bars: A–D (5 cm), F, L (2 cm), G, M–O, Q (1 cm), I (2 mm), J (5 mm); diameter of the coin for scale: 2 cm (E, H, K, P).