1. Stiff leathery-leaved fern of western North America having ovate fronds parted to the midrib
   - leatherleaf, leathery polypody, coast polypody

Type of: polypody

• family Scheuchzeriaceae
• family Schistosomatidae
• family Schizaeaceae
• family Schizophyceae
• family Schizosaccharomycetaceae
• family Sciadopityaceae
• family Sciaenidae
• family Sciaridae
• family Scincidae
• family Sciuridae
• family Sclerodermataceae
• family Sclerotiniaceae
• family Scolopacidae
• family Scolytidae
• family Scomberesocidae
• family Scombresocidae
• family Scombridae
• family Scorpaenidae
• family Scrophulariaceae
• family Scutigeridae
• family Scyliorhinidae
• family Secotiaceae
• family Selaginellaceae
• family Sepiidae
• family Septobasidiaceae