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sporopollenin

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spo·ro·pol·len·in  (spôr-pl-nn, spr-)
n.
A polymer that constitutes the outer wall of spores and pollen grains.
sporopollenin  (spôr-pl-nn)
An organic polymer that is extremely resistant to degradation. Pollen grains and many kinds of spores have a protective outer coating of sporopollenin, which is so durable that microfossils of sporopollenin are found in rocks over 500 million years old.
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resting cysts, unlike many other dinoflagellate cysts, possess an outer layer of calcite beneath which is a thin sporopollenin wall.
Consumption of Scrippsiella lachrymosa resting cysts by the eastern ... by Persson, Agneta; Smith, Barry C. / Journal of Shellfish Research
The protective pigment, called sporopollenin, and several of its long-lived breakdown products absorb a specific wave-length of ultraviolet radiation, says Lomax.
Spores record changes in ozone concentration by Science News
 
 
 
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