Huvenia

Huvenia is a genus of extinct plants of the Early Devonian (Pragian or Siegenian stage, around 413 to 411 million years ago), found in slate deposits of the Rhenish Massif.

[1] The sporophyte generation consisted of leafless stems (axes), which appear to be flattened, and which branch dichotomously.

The strand of conducting tissue contains simple tracheids, making this a vascular plant (tracheophyte).

Sporangia appear to be twisted, but it is not clear whether this feature was present in life or developed after death.

[2] In 2004, Crane et al. published a cladogram for the polysporangiophytes, in which Huvenia is placed in the Rhyniaceae.