Coleofasciculus chthonoplastes (Thuret ex Gomont) M. Siegesmund et al.

Laguna madre, Kenedy Ranch, sands flats, submerged conditions (14_2). Formaldehyde preserved mat.

Laguna madre, Kenedy Ranch, sands flats, submerged conditions (14_1).Formaldehyde preserved mat. Surface: Lyngbya sp. - 90%, Coleofasciculus sp. - 10%. Slimy layer below the surface: Coleofasciculus sp. - 40%, Coleofasciculus chthonoplastes - 50%, Lyngbya sp. - 10%. 2 mm deep: Coleofasciculus chthonoplastes -100%, with very rare occurrence among sediments. Note: Thickness of the mat is ~ 1 mm, with well developed surface layer (Lyngbya sp.). Diatoms are noticeable.

Laguna madre, Kenedy Ranch, sands flats (15_5).Overgrown mat. Surface: Lyngbya sp. - 100% (with 50% of coverage). Slimy layer below the surface: Coleofasciculus chthonoplastes - 50%, Schizothrix sp. - 25%, Lyngbya sp. 10%, Porphyrosiphon sp.-10%, Spirulina - 5%.. 2 mm deep:same as a second layer from the top. Note: Thickness of the mat is ~ 1.5 mm, with poorly developed surface layer.

Laguna madre, Kenedy Ranch, sands flats (15_4). Preserved material with formaldehyde. Surface: Lyngbya sp. - 25%, Schizothrix sp. - 25%, Coleofasciculus chthonoplaste - 25%, Coleofasciculus sp. -25%. Slimy layer below the surface: absent (very thin mat). 2 mm deep: Coleofasciculus chthonoplastes - 4%, Schizothrix - 1%, empty sheaths - 95%. Note: Thickness of the mat (colored surface layer) is ~ 0.5 mm.

Laguna madre, Kenedy Ranch, sands flats (15_3). Preserved material with formaldehyde. Surface: Lyngbya sp. - 80%, Schizothrix sp. - 10%, rest - 10%. Slimy layer below the surface: Coleofasciculus chthonoplastes - 80%,, Schizothrix - 10%, rest - 10%. Empty sheaths from Lyngbya sp. observed. 2 mm deep: Coleofasciculus chthonoplastes - 90%, Schizothrix - 5%, rest - 5%. Note: both Lyngbya sp. and Coleofasciculus ssp. are motive, and probably light and salinity sensitive. Thickness of the mat is ~2 mm.