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. 2012 Jun;12(6):535–548. doi: 10.1089/ast.2011.0742

FIG. 5.

FIG. 5.

SEM images of filamentous and coccoidal cyanobacteria from surfaces of Vai Lahi and Vai Si‘i stromatolites (air-dried samples). (A and B) Surface of cyanobacterial mats mineralized with aragonite. (C) Permineralized common mucilage sheaths. (D) Aragonite grains precipitated in a filamentous mat. (E) Aragonite nanogranules (white arrows) in the mucus enveloping cells of coccoidal cyanobacteria. (F) An older part of a Vai Si‘i stromatolite with aragonite nanogranules recrystallizing into larger crystals within cyanobacterial mucilage sheaths.