Fig. 7
From: Re-study of Guangdedendron micrum from the Late Devonian Xinhang forest
Sporophylls and spores of Guangdedendron micrum from Jianchuan mine. A A partially preserved strobilus, showing sporangia on the adaxial surface of sporophyll pedicels. PKUB16049. B A partially preserved strobilus, showing megaspores and sporophylls. PKUB16141. C Mid-upper part of a strobilus with helically arranged sporophylls in face and lateral view. Arrow indicating portion enlarged in H. PKUB16058. D Enlargement of portion in Fig. 5B (arrow, 180° rotated), showing sporophyll laminae and pedicel in lateral view. E Enlargement of portion in Fig. 5C (arrow 1, 180° rotated), respectively. Showing sporophyll laminae and pedicel in lateral view and partially preserved sporangia, arrows indicating megaspores. F Enlargement of arrowed portion in (A), showing sporangia. G Enlargement of portion in Fig. 5C (arrow 2, 180° rotated), showing sporophyll laminae in face view. H Enlargement of portion in (C) (arrow), showing sporophyll laminae in face view with downturned heels. I Part of a strobilus showing megaspores, the arrow indicating portion enlarged in (K). PKUB16020a. J, K Enlargement of arrowed portions in Additional file 1: Fig. S1Q and 7I, respectively. Showing megaspores and spiny ornamentations. L Megaspores with spiny ornamentations. Scale bars: A, C, D (1 cm), B, F (5 mm), E, G–I (2 mm), J (1 mm), K, L (500 μm)