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| The Stereocaulons have a warty, white crustose primary thallus that soon gives way to a fruticose secondary thallus. The stems, or pseudopodetia, are solid. The lower surface of the pseudopodetia of S. tomentosum is covered with felty tomentum. Flat lobules, or phyllocladia, arise from the upper surface. Numerous dark apothecia and small cephalodia contrast with the silver gray color of the thallus. |