Excellent specimen.
Big oldest Silurian land plant Cooksonia sp. big Pachytheca and unknown Silurian plants

Upper Silurian (Ludlowian/Pridolian), ~423 million years ago. Holy Cross, Mountains. Kielce region, Poland
Dimension: matrix 25x17mm,

Pachytheca was a very primitive sphere-shaped plant that lived from the late Silurian to the early Devonian.
The first fossil records of vascular plants, that is, land plants with tissues that carry food, appeared in the second half of the Silurian period. The earliest known representatives of this group are the Cooksonia

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