På de betonpiller langs vejen ser du grågrønne, rustfarvede til orange-gule pletter: dette er lav.
En lav er en samlivsform af en alge og en svamp. De har brug for hinanden for at kunne leve. Svampen optager vand og mineraler fra omgivelserne, algen sørger for produktionen af sukker.
Lave er tilpasset temmelig tørre, ofte endda ekstreme miljøforhold. De er pionerer, du finder dem endda på sten. Lave kan blive meget gamle. De er i arkæologien nogle gange et redskab til aldersbestemmelse.
De buskformede lave på stammerne af poplerne er meget følsomme over for luftforurening. De bliver brugt som bioindikatorer og fortæller dig noget om luftkvaliteten.
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