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Outside the stele lies the endodermis, which is the innermost cell layer of the cortex. The concept of the stele was developed in the late 19th century by French botanists P. E. L. van Tieghem and H. Doultion as a model for understanding the relationship between the shoot and root, and for discussing the evolution of vascular plant morphology. [2]
The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis and is the outer most part of the stele of plants. [ citation needed ] Although it is composed of non-vascular parenchyma cells, it's still considered part of the vascular cylinder because it arises from the procambium as do the vascular tissues ...
Baal with Thunderbolt or the Baal stele is a white limestone bas-relief stele from the ancient kingdom of Ugarit in northwestern Syria. The stele was discovered in 1932, about 20 metres (66 ft) from the Temple of Baal in the acropolis of Ugarit, during excavations directed by French archaeologist Claude F. A. Schaeffer .
The word phyletic derives from the Greek φυλετικός phūletikos, which conveys the meaning of a line of descent. [2] Phyletic gradualism contrasts with the theory of punctuated equilibrium, which proposes that most evolution occurs isolated in rare episodes of rapid evolution, when a single species splits into two distinct species, followed by a long period of stasis or non-change.
In maximum parsimony, Dollo parsimony refers to a model whereby a characteristic is gained only one time and can never be regained if it is lost. [8] For example, the evolution and repeated loss of teeth in vertebrates could be well-modeled under Dollo parsimony, whereby teeth made from hydroxyapatite evolved only once at the origin of vertebrates, and were then lost multiple times, in birds ...
The Medullosales is an extinct order of pteridospermous seed plants characterised by large ovules with circular cross-section and a vascularised nucellus, complex pollen-organs, stems and rachides with a dissected stele, and frond-like leaves. [1] Their nearest still-living relatives are the cycads. [2] Most medullosales were small to medium ...
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Ramesses Stele: ANET 255 (Stelae of Seti I and Ramses II) The First Stele of Seti I has been described as "the most impressive find from Egypt’s rule over Canaan". [d] The first stele is considered to testify to the presence of a Hebrew population: the Habiru, which Seti I protected from an Asiatic tribe. [6] [e]