Lav (symbiotisk organisme): Forskelle mellem versioner
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<ref>[http://www.esa.int/esaCP/SEMUJM638FE_index_0.html 8 November 2005, ESA: Lichen survives in space] Citat: "...two different species ([[Rhizocarpon geographicum]] and [[Xanthoria elegans]]) were exposed for a total 14.6 days before being returned to Earth...indicate that lichens have the capacity to resist full exposure to the harsh space conditions, especially high levels of [[Ultraviolet stråling|UV radiation]]. Analysis post flight showed a full rate of survival and an unchanged ability for [[Fotosyntese|photosynthesis]]..."</ref>
<ref>[http://www.spacedaily.com/news/life-05zzzzzzzr.html Nov 09, 2005, Space Daily: Lichen Survives In Space] Citat: "...suggests that lichens might survive at the surface of [[Mars (planet)|Mars]]..."</ref>.
Laver der vokser på hårde overflader er ofte skorpeformede, mens jordboende laver kan være stærkt forgrenede som små buske. [[Epifyt]]iske
Mange lavtyper ynder et fugtigt, men alligevel lysbeskinnet miljø. Det finder de fx på nordsider af [[træstamme]]r og [[bygning]]er.
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