Three to six sporangia are fused into a synangium.
The synangia are placed on the lower side of the leaflets.
Leaflets of Pecopteris with these synangia are called
Scolecopteris.
Transverse section of synangia of Scolecopteris, each consisting
of 4 or 5 sporangia.
The cell structure of the wall is well preserved. Spores are visible in the
sporangia.
Chert from Freital (Sachsen). Width of the photo 3 mm. Coll. H.-J. Weiss.
Photo W. Schwarz.
Weiss, H.-J., 2002. Beobachtungen zur Variabilität der Synangien
des "Madenfarns"