Picture: White Birch, Tahquamenon Falls State Park, Upper Peninsula, MichiganPicture: Detail of Red Pine bark, Pinery Provincial Park, Ontario, CanadaPicture: Ponderosa pine cones and needles, Grand Canyon National Park, ArizonaPicture: Ponderosa Pine bark, Grand Canyon National Park, ArizonaPicture: Ponderosa Pine trunks, Grand Canyon National Park, Arizona

Picture: Maple leaf and Pine needles, Brown County State Park, IndianaPicture: Maple leaf and Pine needles, Brown County State Park, IndianaPicture: Red maple leaves, Lake Groton, VermontPicture: Maple leaf and Pine needles, Brown County State Park, IndianaPicture: Maple leaves and Pine needles, Brown County State Park, Indiana

Picture: Maple leaves, Council Lake, Hiawatha National Forest, Upper Peninsula, MichiganPicture: Beech leaf and club moss, Elkmont, Great Smoky Mountains National Park, TennesseePicture: Fern frond on log, Oak Openings area, Toledo, OhioPicture: Maple leaf, Elkmont, Great Smoky Mountains National Park, TennesseePicture: Mosses and maple leaves, Big Island Lake, Hiawatha National Forest, Upper Peninsula, MichiganPicture: Lichen and maple leaf, Big Island Lake, Hiawatha National Forest, Upper Peninsula, Michigan

Picture: Colorful maple leaves and myrtle, Council Lake, Hiawatha National Forest, Upper Peninsula, MichiganPicture: Mayapple leaves, Spicer Lake County Park, IndianaPicture: Colorful maple leaf, Potato Creek State Park, Indiana

Picture: Sea Grape leaves, Shell Mound trail, Ding Darling National Wildlife Reserve, Sanibel Island, FloridaPicture: Gumbo Limbo bark, Shell Mound trail, Ding Darling National Wildlife Refuge, Sanibel Island, FloridaPicture: Gumbo Limbo bark, Shell Mound trail, Ding Darling National Wildlife Refuge, Sanibel Island, FloridaPicture: Gumbo Limbo bark, Shell Mound trail, Ding Darling National Wildlife Refuge, Sanibel Island, Florida

Picture: Amanita mushroom, Big Island Lake, Hiawatha National Forest, Upper Peninsula, MichiganPicture: Mushrooms near Grand Sable Dunes, Pictured Rocks National Lakeshore, Upper Peninsula, MichiganPicture: Amanita mushroom, Pete's Lake, Hiawatha National Forest, Upper Peninsula, MichiganPicture: Mushroom and maple leaves, Potato Creek State Park, IndianaPicture: Brown mushrooms and fallen leaves, Big Island Lake, Hiawatha National Forest, Upper Peninsula, MichiganPicture: Yellow mushroom and fallen leaves, Big Island Lake, Hiawatha National Forest, Upper Peninsula, Michigan

Picture: Fern frond on log, Oak Openings area, Toledo, OhioPicture: Mayapple leaves, Spicer Lake County Park, IndianaPicture: Trunk patterns, Potawatomi Greenhouse, South Bend, Indiana