You searched for: Language UND Remove constraint Language: UND Place Houghton Remove constraint Place: Houghton Place Michigan Remove constraint Place: Michigan Place Ottawa National Forest; ca 15 air mi SW of L'Anse. Silver Mountain, an igneous dome. Remove constraint Place: Ottawa National Forest; ca 15 air mi SW of L'Anse. Silver Mountain, an igneous dome. Topic Polypodiales Remove constraint Topic: Polypodiales Topic Polypodiopsida Remove constraint Topic: Polypodiopsida Topic Polystichum Remove constraint Topic: Polystichum