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Lišejníky (Lichenes)

6. 10. 2010

Lišejníky (Lichenes)

 

  • = lichenizované houby
  • lichenologie = věda, kteár se zabývá lišejníky
  • podvojný organismus
  • houba - heterotrofní + sinice/zelená řasa - autotrofní
  • pohlavně se rozmnožuje pouze houba, ale nejčastěji nepohlavně
  • tělo = stélka:
    1. keříčkovitá
      • lišejník přirostlý k podkladu malou plochou
      • např. dutohlávka sobí
    2. lupenitá
      • přirostlá větší části k podkladu
      • např. terčovka bublinatá, terčovník zední
    3. korovitá
      • celá stélka přirostlá k podkladu
      • např. lišejník zeměpisný
  • anatomie:
    • tvořený houbou + sinicí/zelenou řasou
    • vrstvy:
      • svrchní korová vrstva
      • řasová vrstva
      • dřeňová vrstva
      • spodní korová vrstva
      • rhiziny

 

lisejnik.jpg

 

  • význam:
    • jedny z prvních organismů, které osidlují nově vzniklé oblasti a narušují podklad pro další organismy
    • indikátory čistoty ovzduší
    • zdroje potravy tam, kde jsou např. nízké teploty

 

  • zástupci:
    • dutohlávka sobí
    • terčovka bublinatá
    • terčovník zední
    • lišejník zeměpisný

 

 

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