_:genid1 "Free to use with credit to the original figure source."^^ . "summer-maximum-temperature-abundance-collema" . "Summer Maximum Temperature and the Abundance of Collema"^^ . "A negative correlation existed between summer maximum temperature (mean daily maximum temperature during June) and subsequent abundance of the lichen Collema, which dominates the biological soil crust in many semi-arid western ecosystems. Even after 2 cooler years, the lichen had not recovered from the warm period of 1997 to 2003. Credit: J. Belnap, S.L. Phillips, and T.T. Troxler, U.S. Geological Survey."^^ . _:genid1 . . .