Ophioglossum (adder's-tongue)

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shubhada nikharge

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Aug 10, 2009, 5:18:59 AM8/10/09
to indian tree pix

Hi,

pic of Ophioglossum was taken at Conservation Education centre, Goregaon East, mumbai.

Date:  2nd Aug 09.


some info about it from Wikipedia :


It is a pteridophyte. The pteridophytes are vascular plants (plants with xylem and phloem) that neither flower nor produce seeds, hence they are called vascular cryptogams. They reproduce and disperse only via spores.

 

Ophioglossum (adder's-tongue)

Family Ophioglossaceae,

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 up to 1,400 chromosomes. However, most species only have chromosomes in the 240-300+ range.


Ophioglossum represents an evolutionary dead end through repeated cycles of polyploidy and is possibly at the verge of extinction.

(Can anyone explain this?)

 

cheers,

shubhada


 




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