#asteroxylaceae

[heresthatrainyday]

†Asteroxylon mackiei

†Asteroxylaceae (†Drepanophycales)*

Early Devonian (/Pragian) ~410 million years ago

*Extinct order of lycophytes. This species sister to all other lycophytes.

Named for its star-shaped xylem, this extinct lycopsid had G-type (annular) tracheids and enations (with stomata) along the main axis. The rhizome-like structure had no enations, and had root-like branches. Branching was somewhat overtopping (anisotomous) to isotomous. Asteroxylaceae, unlike the Drepanophycaceae, had enations with no trace (vasculature).

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