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Foliose lichen Flavoparmelia caperata with leaf-like structures is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi in a mutualistic relation

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

Travelling along the North Sea coast from Bremerhaven to Cuxhaven in spring

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

Yellow and gray lichens on coastal rocks and stones in eastern Crimea

Lichen on rocks in Waterton National Park in the Canadian Rockies

Fall color foliage hits Charlotte, NC.

Lichen in stone background. Mushroom close-up.

A grey round patch of lichen on a rock covered with orange lichen. Natural background

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.

This is the common orange lichen (Xanthoria parietina) on a rock.

A sample of greenish blue lichen growing on a tree.

Closeup on green Lungwort lichen Lobaria pulmonaria

Calogaya lichens on rocks

large rocks covered with moss. gray lichen on a large stone

Lichen and moss close-up view, full frame image suitable for Nature, ecosystem background. Galicia, Spain.

A colony of orange lichens on a rock. Like gold on a stone. On the mountain Bjelasnica, Bosnia and Herzegovina.

Lichen growing on a rock, possibly marble, in a Connecticut rock garden. 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. This species appears to be rock greenshield lichen. Photo taken in winter.

Lichen pattern on the stone. Close up photo

Lichen, Fungus, Macrophotography, Extreme Close-Up

Closeup of vibrant yellow and green lichenia moss thriving on a rocky surface

arctic orange lichen on rock in Svalbard

Orange atoms lichen, Squamulea subsoluta

Orange, green, yellow, grey organic patterns on tree bark.

Caloplaca marina is a marine lichen growing on coasts, enduring salt and environmental factors, providing key ecological information.

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.

Yellow lichen foliage on a bark tree

Antelope Island, Utah

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

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