Terrestrial Palaeoecology and Global Change

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.