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Cooksonia hemispherica

Cooksonia hemispherica (order Rhyniopsida) Extremely primitive plant, a few centimetres high, from the Upper Silurian and Lower Devonian. Members of the family did, however, possess an epidermis (protective outer layer) and stomata (specialized pores) to control the passage of gases. They also had an underground rooting portion, the rhizome, and they branched dichotomously. C. hemispherica is the first representative of the Rhyniaceae, and is known from the Silurian of Europe. See also PSILOPHYTALES; and RHYNIA.

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"Cooksonia hemispherica." A Dictionary of Earth Sciences. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"Cooksonia hemispherica." A Dictionary of Earth Sciences. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/cooksonia-hemispherica

"Cooksonia hemispherica." A Dictionary of Earth Sciences. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/cooksonia-hemispherica

Cooksonia hemispherica

Cooksonia hemispherica (family Rhyniaceae) An extremely primitive plant from the Upper Silurian and Lower Devonian belonging to a family whose members did, however, possess an epidermis and stomata to control the passage of gases. They also had an underground rooting portion, the rhizome, and they branched dichotomously. C. hemispherica is the first representative of the Rhyniaceae, and is known from the Silurian of Europe.

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"Cooksonia hemispherica." A Dictionary of Plant Sciences. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"Cooksonia hemispherica." A Dictionary of Plant Sciences. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/cooksonia-hemispherica-0

"Cooksonia hemispherica." A Dictionary of Plant Sciences. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/cooksonia-hemispherica-0