Undulate
undulate (adjective) – wavy, bent or curved alternately up and down (not: in and out, see sinuous, sinuate), wavy, as applied to a surface, or to a "crisped" margin of the thallus or lobes, which are often lifted off the substrate and appear as a series of more or less regular arcs, as in many species of Parmotrema or cetrarioid lichens; often, but not always, associated with being crenate; can also be applied to apothecia (disks or margins); regularly bent up and down, sometimes strongly folded (crisped).
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