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Stockmansella is a genus of extinct plants of the Middle Devonian (Eifelian stage, around 393 to 388 million years ago), fossils of which have been found in north-west Germany. The sporophyte generation consists of prostrate dichotomizing stems (axes) up to 10 cm long and around 3mm wide, which at intervals produce narrower smooth upright stems. These bear sporangia (spore-forming organs) on short lateral branches (sporangiophores). The prostrate stems have bulges from which rhizoids form. Both prostrate and upright stems have a central strand of conducting tissue which contains simple tracheids, so that Stockmansella is a vascular plant.
The genus was created by Fairon-Demaret for fossil forms previously assigned to Taeniocrada but which differ in having single lateral sporangia.
Text excerpted from the Wikipedia article Stockmansella by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
