Terrestrial Palaeoecology and Global Change

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Chapter 4. Palaeoecogeography 97 b a c d Fig. 43. Scanning electron micrographs of cutinized thalloid plants from the Devonian cuticle coals: (a, e) Orestovia, compressed specimens (courtesy of A.R. Ananiev) and a stomata-like structure supposedly derived from a sex organ (Krassilov, 1981), (b, c) gametangial conceptacles in Shuguria, a morphologically similar alga-like form, (d) Bitellaria, bands of hydroid-like fusiform cells traversing the cuticle (Krassilov et al., 1987a). e
98 Valentin A. Krassilov. Terrestrial Palaeoecology a b c d Fig. 44. Light microscopy of Shuguria ornata, a structurally preserved thalloid plant from the upper Middle Devonian of Pavlovsk, Voronezh Region, European Russia: (a) shoot fragments from a cuticle coal, (b) cleared cortex tissue showing conceptacles, (c) ripe conceptacle shedding its neck canal cell, (d) perforation at the site of a disintegrated conceptacle. a b c d Fig. 45. Light microscopy of a structurally preserved thalloid plant, Shuguria ornata, from the upper Middle Devonian of Pavlovsk, Voronezh Region, European Russia: (a, b) intact conceptacles showing gametangia as the radially arranged bulging cells of the basal chamber, topped by a neck canal cell, (c) intact gametangia adjacent to the lower tier of neck cells, (d) conceptacle at a later stage, with empty gametangia.
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Terrestrial Palaeoecology and Global Change

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