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FIG. 2.
Microbial mats from Azorean lava caves. (A) Yellow microbial mats coat the lava cave wall. (B) White and pinkish-tan microbial colonies from a lava cave wall. (C) White and tan colonies on a wall that is dripping water. (D) White and tan microbial colonies adorn a lavacicle on the cave ceiling. (E) Yellow and white microbial mats from a lava cave wall. Field of view is approximately 2.5 m (A), 5 cm (B), 6 cm (C), 2 cm (D), and 4 cm (E) across. Images courtesy of Kenneth Ingham; used with permission. Color images available online at
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