![](http://www.alamy.com/thumbs/6/D83B26EB-374A-431D-8DF9-89525E1397A3/DTGMH9.jpg)
Nostoc sp.
A cyanobacterium. Members of this genus occur frequently in lichens, especially those in wet habitats.
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Photo credit: © Natural History Museum, London / Alamy / Afripics
License: Licensed
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Keywords: algae, autotrophic, bacteria, bacterium, blue-green, chain, cyanobacteria, cyanobacterium, cyanophyceae, cyanophyta, green, heterocyst, lichen, microscopic, nitrogen, nostoc, nostocaceae, nostocales, partner, pattern, photobiont, prokaryote, prokaryotic, sp, vibrant