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Nostoc

 
Nostoc colony on limestone, Dorset
 
 
Close-up of colony
 
 
Colony amongst seedlings and mosses
 
 
 
Nostoc filament - smaller vegetative cells and
 
empty-looking heterocysts
 
 
Filament curling up in a mucilage sheath
 
 
Small balls of filaments
 
 
Edge of thallus - mucilage and filaments
 
 
Nostoc spores (akinetes)