What are the two species of Rhynia?
The two species of Rhynia are gwynne-vaughanii and R. The underground stem-like runners are connected to the main stem and these are photosynthetic and branched. Rhynia is a living fossil and belongs to the phylum Pteridophyta. They are the plants of the Silurian and Devonian periods.
What is Rhynia major?
Rhynia was a vascular plant, and grew in association with other vascular plants such as Asteroxylon mackei, a probable ancestor of modern clubmosses (Lycopsida), and with pre-vascular plants such as Aglaophyton major, which is interpreted as basal to true vascular plants.
What is the common name of Rhynia?
Introduction. One of the first Rhynie chert plants to be described and perhaps the most abundant is the form Rhynia. The plant was originally described and classified by Kidston and Lang in 1917, 1920a and assigned the species name Rhynia gwynne-vaughanii.
How many species of Rhynia are there?
one species
Rhynia is a genus of Early Devonian fossil land plants. Only one species is known, R.
Is Rhynia a bryophyte?
The Rhynia is a Devonian plant because it had more advanced anatomical features than bryophytes. Hence, the correct answer is option (B).
Is Rhynia a Pteridophyte?
Rhynia is a single-species genus of the Silurian and Devonian vascular plants that belong to the fossil pteridophyte.
What is the genus and species of Rhynia?
Accordingly, he transferred it to a new genus Aglaophyton, leaving R. gwynne-vaughnii as the only known species of Rhynia. Rhynia is the type genus for the rhyniophytes, established as the subdivision Rhyniophytina by Banks, but since treated at various ranks.
What is the genus of a rhyniophyte?
Rhynia is the type genus for the rhyniophytes, established as the subdivision Rhyniophytina by Banks, but since treated at various ranks. In 2004, Crane et al. published a cladogram for the polysporangiophytes, in which Rhynia and the other Rhyniaceae are placed as basal vascular plants (tracheophyes).
What are gametophytes of Rhynia?
Evidence of the gametophyte generation of Rhynia has been described in the form of crowded tufts of diminutive stems only a few mm in height, with the form genus name Remyophyton delicatum. Like those of Aglaophyton major, Horneophyton lignieri and Nothia aphylla the gametophytes of Rhynia are dioicous,…
What is the shape of Rhynia above?
Rhynia Above: Transverse sections through axes of Rhynia gwynne-vaughanii. The star-shaped axes, right of centre, are a result of shrinkage during decay and desiccation of the stems (scale bar = 1mm). Introduction Morphology Relationships Palaeoecology Introduction