Definitions for ophioglossum

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Princeton's WordNet

  1. Ophioglossum, genus Ophioglossum(noun)

    the type genus of the fern family Ophioglossaceae

Freebase

  1. Ophioglossum

    Ophioglossum 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 1,260 chromosomes. In comparison, most species have far fewer chromosomes.

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"ophioglossum." Definitions.net. STANDS4 LLC, 2014. Web. 21 Sep. 2014. <http://www.definitions.net/definition/ophioglossum>.

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