Rhyniopsida

Surface view of a polished piece of Rhynie chert showing many cross-sections of Rhynia stems (axes). Scale bar is 1 cm.

Rhyniopsida is a class of extinct early vascular plants, with one family, Rhyniaceae, found in the Early Devonian (around 419 to 393 million years ago). They are polysporangiophytes, since their sporophytes consisted of branched stems bearing sporangia (spore-forming organs). They lacked leaves or true roots but did have simple vascular tissue. The group was first placed in a subdivision of the division Tracheophyta under the name Rhyniophytina (see Polysporangiophyte: Taxonomy for alternative names). Informally, they are often called rhyniophytes. More recently the name paratracheophytes has been suggested, to distinguish such plants from 'true' tracheophytes or eutracheophytes.

单词	Rhyniaceae
释义	Rhyniaceae 英语百科 Rhyniopsida Rhyniopsida is a class of extinct early vascular plants, with one family, Rhyniaceae, found in the Early Devonian (around 419 to 393 million years ago). They are polysporangiophytes, since their sporophytes consisted of branched stems bearing sporangia (spore-forming organs). They lacked leaves or true roots but did have simple vascular tissue. The group was first placed in a subdivision of the division Tracheophyta under the name Rhyniophytina (see Polysporangiophyte: Taxonomy for alternative names). Informally, they are often called rhyniophytes. More recently the name paratracheophytes has been suggested, to distinguish such plants from 'true' tracheophytes or eutracheophytes.
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