Ophioglossum


Ophioglossum
Ophioglossum
Ophioglossum vulgatum
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Psilotopsida
Order: Ophioglossales
Family: Ophioglossaceae
Genus: Ophioglossum
L.
Species

Some 25-30, including:
Ophioglossum austroasiaticum
Ophioglossum azoricum
Ophioglossum californicum
Ophioglossum costatum
Ophioglossum crotalophoroides
Ophioglossum engelmannii
Ophioglossum lusitanicum
Ophioglossum nudicaule
Ophioglossum pedunculosum
Ophioglossum petiolatum
Ophioglossum polyphyllum
Ophioglossum pusillum
Ophioglossum pycnosticum
Ophioglossum reticulatum
Ophioglossum tenerum
Ophioglossum thermale
Ophioglossum vulgatum

Ophioglossum (adder's-tongue) is a genus of about 25-30 species of Ophioglossales in the family Ophioglossaceae, with a cosmopolitan but primarily tropical and subtropical distribution. The name Ophioglossum comes from the Greek, and means "snake-tongue".

Adders-tongues are so-called because the spore-bearing stalk is thought to resemble a snake's tongue. Each plant typically sends up a small, undivided leaf blade with netted venation, and the spore stalk forks from the leaf stalk, terminating in sporangia which are partially concealed within a structure with slitted sides. The plant grows from a central, budding, fleshy structure with fleshy, radiating roots. When the leaf blade is present, there is not always a spore stalk present, and the plants do not always send up a leaf, sometimes going for a year to a period of years living only under the soil, nourished by association with soil fungi.

Ophioglossum has the highest chromosome count of any known living organism, with 1,262 chromosomes. However, most species only have chromosomes in the 240-300+ range.

References

External links


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Look at other dictionaries:

  • Ophioglossum — Ophioglossum …   Wikipédia en Français

  • Ophĭoglossum — L. (Natterzunge), Farngattung aus der Familie der Ophioglossazeen, ausdauernde Kräuter mit einem einzigen Blatte, das aus einem obern fruchtbaren und einem untern sterilen Abschnitt besteht; der erstere stellt eine gestielte Ähre dar, die zwei… …   Meyers Großes Konversations-Lexikon

  • Ophioglóssum — L., Farnkrautgattg. der Ophioglosseen. O. vulgātum L. (Natterzunge [Abb. 1292]), mit knolligem Wurzelstock und länglich eiförmigem Blatt, auf moorigen Wiesen …   Kleines Konversations-Lexikon

  • Ophioglossum —   Ophioglossum …   Wikipedia Español

  • Ophioglossum — Ophioglossum …   Wikipédia en Français

  • Ophioglossum L. — Род 9. Ужовник (Сем. Ophioglossaceae – Ужовниковые) 13. Ophioglossum vulgatum L. – Ужовник обыкновенный …   Флора Центрально-лесного государственного заповедника

  • Ophioglossum — ID 57516 Symbol Key OPHIO Common Name adderstongue Family Ophioglossaceae Category Fern Division Pteridophyta US Nativity N/A US/NA Plant Yes State Distribution AK, AL, AR, AZ, CA, CT, DC, DE, FL, GA, HI, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI,… …   USDA Plant Characteristics

  • Ophioglossum — noun the type genus of the fern family Ophioglossaceae • Syn: ↑genus Ophioglossum • Hypernyms: ↑fern genus • Member Holonyms: ↑Ophioglossaceae, ↑family Ophioglossaceae • Member Meronyms …   Useful english dictionary

  • Ophioglossum — Natternzungen sind: Eine Gattung von Farnen, die Natternzungen Eine historische Bezeichnung fossiler Haizähne …   Deutsch Wikipedia

  • Ophioglossum — Ophioglọssum   [griechisch], die Pflanzengattung Natternzunge …   Universal-Lexikon


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