Peltigera dog-tooth lichen refers to several species in the genus Peltigera, commonly called dog lichen or dogtooth lichen, named for the fang-like, root-like structures (rhizines) on their underside, resembling dog teeth, and also for their historical use in treating dog bites or rabies in medieval times, notes Missouri Department of Conservation and Britannica. These leafy (foliose) lichens, like Peltigera canina or Peltigera membranacea, grow in moist, rich areas on soil, moss, or rocks, forming soft, gray-brown patches with wrinkled tops and white undersides.
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