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Fig. 8 | BMC Ecology and Evolution

Fig. 8

From: Re-study of Guangdedendron micrum from the Late Devonian Xinhang forest

Fig. 8

Megaspores of Guangdedendron micrum displaying ornamentations under LM after maceration (B–I) or under SEM (J–T), respectively. A A piece of carbonaceous fragment of strobilus peeled from Fig. 5C (middle arrow indicating portions, nearby the apex of strobilus) before maceration. B, C Megaspores after maceration of fragment in (A). Arrows in (B) and (C) indicating portions enlarged in (D–I), respectively. D, E Enlargement of portions in (B) (arrow 1 and 2), respectively, displaying megaspore clusters probably borne in tetrads. F–I Enlargement of portions in (B) (arrow 3) and C (arrow 1–3), respectively. Megaspore consisting of a body with spiny ornamentations and a prominent gula. J, K Megaspore clusters under SEM, probably borne in tetrads. L, M Megaspore in lateral view, each consisting of a body and a gula. Arrows in (L) and (M) indicating portions enlarged in (P) and (Q), respectively. N, O Megaspores in roughly proximal view. Arrow in (N) indicating portion enlarged in (R). P–R Enlargement of portions in (L) (arrow), M (arrow) and N (arrow), respectively. Showing spiny and tapered ornamentations. S Spiny and tapered ornamentations. T Enlargement of portion in Additional file 3: Fig. S3C (arrow 2), showing spiny ornamentations. Scale bars: A (1 mm), B, C (2 mm), D–J, L–O (200 μm), K (500 μm), P, S (20 μm), Q, R, T (50 μm)

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