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Detail of the bark of a tree on which lichen grows.

Colorful Orange Yellow and Green Lichen Detail - Closeup macro detail with selective focus and shallow depth of field.

Moss on a stone at the high shaft in the Bavarian Forest National Park, Looks like a shoe print, eco

Rosette of greenshield lichen on rock in the Connecticut woods, in winter sunlight

Greenshield lichen (Flavoparmelia sp.) growing in winter.

Close-up photo of a marine lichen closeup. Sea life on a water's edge.

Old gray stone with ancient lichen, natural texture, organic backdrop Abstract stone background

Moss on the Wall

Beautiful circular lichen from Colorado. Unique mix of colors in orange, yellow and green.

Lichen and moss on a tree trunk in tropical surroundings. The picture is taken in Harau Valley in the northwestern part of Sumatra

Orange and gray lichens on coastal limestone stones and rocks in Crimea, Tarkhankut

Rock greenshield lichen and leaf in the Connecticut woods. Though it undergoes photosynthesis, this is not a plant but a symbiotic composite of a fungus and an alga. Lichens also grow on trees and soil. Photo taken in winter.

moss-covered rocks, old rocks mossed over,

Photomicrograph of two rotifers. Rapidly rotating cilia at top of heads, internal organs visible. Live specimen. Wet mount, 10X objective, transmitted brightfield illumination.

Orange fungus or mold on stone or rock on sunny day. Natural texture or background.

Lichen on a rock

Moss lichen on big stone

Textured background of a dirty cement wall with moss, cracks, and dampness.

Orange and gray lichens on coastal limestone stones and rocks in Crimea, Tarkhankut

Ice and bubbles on mossy rock in stream, early spring

Dirty rock covered with moss for natural background

An image of orange lichen on he back of a gravestone in Cape Cod.An image of orange lichen on the back of a gravestone in Cape Cod.

Lichen on quartzite sandstone surface. A pioneer lichen in Bare Rock Succession that helps break down rock and sets the stage for mosses and other plants to follow succession.

Rusavskia elegans (formerly Xanthoria elegans), commonly known as the elegant sunburst lichen, is a lichenized species of fungus in the genus Rusavskia, family Teloschistaceae. Recognized by its bright orange or red pigmentation, this species grows on rocks, often near bird or rodent perches. It has a circumpolar and alpine distribution. Shingle Cove, South Orkney Islands

Old house overgrown orange lichen, Sao Miguel Island, Azores archipelago, Portugal

big Lichen in green and grey growing on alpine rock

Orange and gray lichens on coastal limestone stones and rocks in Crimea, Tarkhankut

Photomicrograph of flatworm,

Burrow in a rock covered with lichen

A thick growth of greenshield lichen on a rock. The leaf-like lobes proclaim this a foliose lichen. Lichens are interesting, often beautiful, life forms. They cover 7% of the earth's surface. Though they undergo photosynthesis, they are not plants. They are composite organisms in which algae and fungi live symbiotically. The three main types are foliose, fruticose and crustose. Lichens are indicators of environmental quality, and they do no harm to the natural substrates on which they grow.

Free Images: "bestof:Liquen crostoso.JPG en crustose lichen pt Liquen Crostoso own Pallastrelli 02/07/2011 Unidentified lichens"

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