The only human colonic bacterium so far shown to be able to degrade crystalline cellulose is another species of Ruminococcus, R. champanellensis. It has been proposed that subjects whose colonic microbiota are capable of degrading this type of cellulose are characterized by possession of this species
This species has been identified as a resident in the human gastrointestinal tract based on the phylogenetic framework of its small subunit ribosomal RNA gene sequences.[PMC 4262072]
COGEM
COGEM released a comprehensive database of pathogenicity assessment of around 2575 bacterial species in 2011. The database ranks the pathogenicity of species on a scale of 1 to 4. Ruminococcus champanellensis ranks on this scale:
Identified as a 'core species' of the human gut microbiome. [PMID: 23222524]