Extinct plant of the Early Silurian age
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Eohostimella heathana is an early, probably terrestrial, "plant" known from compression fossils of Early Silurian age (Llandovery, around ERROR! Start of period Llandovery unknown, perhaps because it was mis-spelt or because it is missing from .
). The chemistry of its fossils is similar to that of fossilised vascular plants, rather than algae. Its anatomy constitutes upright, cylindrical tubes, with a thickened outer cortex, which might have contained traces of lignin or a similar compound, even though no tracheids or similar vessels have been found; the lignin-like compound was presumably associated with its thick outer cortex. It branched dichotomously and might have borne small spines. It was probably affiliated with the rhyniophytes.
References.
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