Rhyniopsida
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Rhyniopsida
(′rī·nē′äp·səd·ə)
(paleobotany) A class of extinct plants in the subkingdom Rhyniophyta characterized by leafless, usually dichotomously branched stems that bore terminal sporangia.
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Rhyniopsida
The earliest demonstrable vascular land plants, appearing in Silurian (mid-Ludlovian) time. Their small, leafless axes were usually branched dichotomously in three planes; adventitious and perhaps pseudomonopodial branching also occurred. Sporangia were usually terminal on the main axes. Some terminated in lateral branches, and some were subtended by adventitious branches. See also Rhyniophyta.
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