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Hicklingia is a genus of extinct plants of the Middle Devonian (around 393 to 382 million years ago). Compressed specimens were first described in 1923 from the Old Red Sandstone of Scotland. Initially the genus was placed in the "rhyniophytes", but this group is defined as having terminal sporangia (spore-forming organs), and later work showed that the sporangia of Hicklingia were lateral rather than strictly terminal, so that it is now regarded as having affinities with the zosterophylls.
Text excerpted from the Wikipedia article Hicklingia by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
