59.5 MB (3.1 MB compressed)
5100 x 4080 pixels
43.2 x 34.5 cm ⏐ 17.0 x 13.6 in (300dpi)
DR. PETER SIVER, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY DR. PETER SIVER, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY
Nostoc - This genus of blue green alga consists of unbranched filaments with heterocysts that become encased in a thick mucilage mass to form a colonial sphere that can reach the size of a baseball.
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