Figure 5
From: An early Devonian flora from the Baviaanskloof Formation (Table Mountain Group) of South Africa
Schematic reconstruction of the sporangia of Cooksonia paranensis showing different position of the operculum (op) in regard to the sporangial chamber (sc): (a) in growth position with the operculum in place, (b) with the operculum compressed laterally showing several wrinkles and (c) with operculum completely tilted.
