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Equisetum telmateia


Equisetum telmateia
Photo Information
Copyright: Ungureanu Liviu (Apashu) Silver Star Critiquer/Gold Note Writer [C: 15 W: 0 N: 126] (937)
Genre: Plants
Medium: Color
Date Taken: 2010-04-11
Categories: Flowers
Exposure: f/8, 1/250 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2010-04-14 5:56
Viewed: 3422
Points: 2
[Note Guidelines] Photographer's Note
Equisetum telmateia (great horsetail or northern giant horsetail) is a species of Equisetum (horsetail) with an unusual distribution, with one subspecies native to Europe, western Asia and northwest Africa, and a second subspecies native to western North America. The North American subspecies is often simply but ambiguously called "giant horsetail", but that name may just as well refer to the Latin American Equisetum giganteum and Equisetum myriochaetum.

Spore-bearing strobilus

It is a herbaceous perennial plant, with separate green photosynthetic sterile stems, and pale yellowish non-photosynthetic spore-bearing fertile stems. The sterile stems, produced in late spring and dying down in late autumn, are 30–150 cm (rarely to 240 cm) tall (the tallest species of horsetail outside of tropical regions) and 1 cm diameter, heavily branched, with whorls of 14–40 branches, these up to 20 cm long, 1–2 mm diameter and unbranched, emerging from the axils of a ring of bracts. The fertile stems are produced in early spring before the sterile shoots, growing to 15–45 cm tall with an apical spore-bearing strobilus 4–10 cm long and 1–2 cm broad, and no side branches; the spores disperse in mid spring, with the fertile stems dying immediately after spore release. Occasional plants produce stems that are both fertile and photosynthetic.

It is found in damp shady places, spring fens and seepage lines, usually in open woodlands, commonly forming large clonal colonies.

There are two subspecies:
Equisetum telmateia subsp. telmateia. Great Horsetail. Europe, western Asia, northwest Africa. Main stem between branch whorls pale greenish white.
Equisetum telmateia subsp. braunii (Milde) Hauke. Northern Giant Horsetail. Western North America, from southeastern Alaska and western British Columbia south to California. Main stem between branch whorls green.


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Critiques [Translate]

  • Great 
  • zetu Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 967 W: 26 N: 3888] (16941)
  • [2010-04-14 9:54]

Salut
Foarte buna seria cu ciperci. Imi place si asta.
Numai bine
Razvan

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