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This looks like P. saxatilis to me, too, but it’s not always easy to distinguish it from P. hygrophila from a distance. In P. saxatilis the rhizines have many short perpendicular side-branches (and these are sometimes further branched); in P. hygrophila the rhizines are simple or fork a few times. The trick is that the outer rhizines (the ones visible in photos like this) are often all simple in both species. It can be hard to locate good clear examples of squarrose rhizines in some specimens with just a hand lens.