Pachytheca in Rhynie chert. Diameter 3.8
The smooth, cuticle-like outside is striking.
Detail of the photo above. The radially arranged tubes are clearly
The inner zone is badly preserved. No details are visible.
Click here to se more details.
Coll. H.-J. Weiss, Rabenau, photos: H. Sahm, Dresden
Take also a look at: Kieseltorf