Fig. 3
From: Re-study of Guangdedendron micrum from the Late Devonian Xinhang forest
Stems and vegetative leaves of Guangdedendron micrum, from Yongchuan (A, B, D, G–M, O–Q, S, U, V) and Jianchuan (C, E, F, N, R, W) mines. A, B In-situ stems with expanded bases. PKUB21000, 21014. C Two adjacent in-situ stems with expanded bases. D An in-situ stem with an expanded base. E, F Two sides of a stem displaying basal expansion and helically arranged oval fissures of broken leaf cushions after leaf abscission. PKUB21004. G–J Stems perpendicular to the bedding plane. H YC-103. K An in-situ stem with leaf cushions. L A once-dichotomized stem. YC-101. M, N Twice-dichotomized stems. M YC-102. O A once-dichotomized leafy stem with leaf bases. P, Q Part and counterpart of helically arranged leaf cushions. YC-105, 104. R A stem with helically arranged leaf cushions. Arrow indicating portion enlarged in Additional file 1: Fig. S1I. PKUB16065. S Fusiform leaf cushions. PKUB21013. T Line illustration of a leaf cushion based on arrowed portion in Q. U Helically arranged leaf bases. Arrow indicating portion enlarged in V. PKUB21007. V Enlargement of arrowed portion in U, indicating fusiform leaf bases with middle vertical grooves in the lower part. W Helically arranged leaf bases, each showing a vertical groove in the middle. PKUB16052a. Scale bars: A, E, F (2 cm), D, G (5 cm), P–R, U, W (1 cm), S, T, V (5 mm); diameter of the coin for scale: 2 cm (B, C, H, J, K, M–O); length of the hammer for scale: I (28.6 cm), L (27.3 cm)