Fig. 3From: Biodeterioration of Roman hypogea: the case study of the Catacombs of SS. Marcellino and Pietro (Rome, Italy)Microscopic observation of biofilm samples collected in situ: a and b micrographs of samples from site 1. Scale bar = 10 μm. c and d Micrographs of samples from site 2. Scale bar = 10 μm. e Sample from site 1 observed at the CLSM showing heterocytous cyanobacteria belonging to the genera Symphyonemopsis and Scytonema julianum. Scale bar = 20 μm. f Sample from site 2 observed at the CLSM showing filaments of Scytonema julianum with exopolysaccaridic envelopes (green) along with Symphyonemopsis sp. and the small filaments of Oculatella subterranean. Scale bar = 20 μmBack to article page