Complete genome sequence of the xylan-degrading Mucilaginibacter sp. strain PAMC26640 isolated from an Arctic lichen

•This is the first ever complete genome sequence in the genus Mucilaginibacter.•Mucilaginibacter sp. strain PAMC26640 was isolated from the Arctic lichen Stereocaulon sp.•Genes predicted involved in xylan-degrading pathway were analyzed. Mucilaginibacter sp. PAMC26640 is a xylan-degrading bacterium isolated from the Arctic lichen Stereocaulon sp. Here, we present the first complete genome sequence of Mucilaginibacter sp. strain PAMC26640, which contains several genes involved in xylan utilization. This genome information provides new insights into the genetic basis of its physiology and further analysis of key metabolic genes related to the xylan degradation pathway.