Table 1. Cyanobacterial morphotypes detected in phototrophic biofilms of Alchichica microbialites based on their morphology and autofluorescence of their pigments.

Morphotype name	Morphology	Size	Probable identification	Localization
Un1	Unicellular	L=2–5 μm		Al66 (3 m)
Un2	Unicellular with sheath	Ø=3 μm, up to 30 μm	Chroococcales Gloeocapsa	Al66 (3 m)
F1	Filamentous with sheath	Ø=1 μm	Oscillatoriales Leptolyngbya	Al13 (10 cm), Al 66 (3 m), Al63 (5 m)
P1	Pseudofilamentous with sheath	Ø=1 to 8 μm	Pleurocapsales Pleurocapsa	Al13 (10 cm), Al66 (3 m), Al63 (5 m), Al57 (8 m), Al51 (14 m)
N1	Filamentous with polar heterocysts and sheath	L=15 μm	Nostocales Rivularia	Al13 (10 cm), Al66 (3 m), Al63 (5 m)
N2	Filamentous with heterocysts and akinetes	L=15 μm	Nostocales Nodularia	Al 66 (3 m)

Abbreviations: Ø, diameter; L, length.

Al followed by a number refers to fixed microbialites from the lake.