maggot stone from Kleinnaundorf near Freital, detail
Fertile pinnules of the tree fern Scolecopteris/Psaronius cut
in various orientations:
cross sections (above centre and right), in-plane sections (above left), longitudinal
sections (below right). What looks like a maggot above right is also a longitudinal
section of a pinnule. Pinnule width up to 2 mm.