Glossary AcrocarpCryoconite holeCryosphereDessication toleranceExtremophileGemmaHydric soilLGMMesicMethanogeneMethanotrophMycobiontOrnitogenic tundraOxygenic photosynthesisPhylogeographicPleurocarpPoikilohydricProtonemaPsychrophilePsychrotrophsQuaternaryXericYBP