Add to Lightbox
Lung Lichen (Lobaria quercizans) on tree trunk, Shenandoah National Park, Virginia, USA. Lichen changes from a silver gray when dry to green when wet. Ovoid brown structures are fruiting bodies called apothecia which give off spores.
Gerry Bishop/Visuals Unlimited, Inc.
all images © Visuals Unlimited
Visuals Unlimited, Inc. specializes in, microscopy, healthcare, medical, wildlife, underwater, agriculture, and science stock photography.