1) Is it a crusty lichen?
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Yes...go to 2.
No...go to 8.
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2) Pale grey in round splodges with tiny grey jam tarts and with a white edge?
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Yes...Ochrolechia parella.
No...go to3.
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3) Grey patches without a white edge and with darker blotches inside
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Yes...Porpidia tuberculosa.
No...go to 4.
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4) Red spots on a dark grey area.
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Yes...Caloplaca crenularia.
No....Go to 5.
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5) Rusty red patches like a mosaic. In shade. Turns yellow where rubbed.
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Yes.....Opegrapha gyrocarpa.
No....Go to 6
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6) Mustard orange grains spreading. In small patches.
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Yes...Candelariella vitellina.
No.....go to 7.
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7) Orange, formed in a neat circle with some grey towards the inside.
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Yes....Caloplaca flavescens.
No .....go to 8.
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8) Is it a leafy lichen?
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Yes...go to 9.
No...go to 14.
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9) Orange, large, spreading, with edges turning up.
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Yes...Xanthoria parietina.
No.....go to 10.
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10) Dark brown with a leafy, shiny edge.
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Yes...Melanelia fuliginosa.
No.....go to 11.
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11) Grey-green with white lines on the surface.
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Yes... Parmelia saxatilis
No....go to 12.
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12) Yellow-green. Large, leafy lobes Spreads over twigs,
trunks and stone
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Yes... Flavoparmelia caperata
No...go to 13.
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13) Small, narrow yellow-grey lobes. On twigs. Trumpet like structures pointing upwards.
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Yes... Xanthoria polycarpa
No...try another key.
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14) Grey-green shrubby lichen. White oval spots on the edges. Looks like a small spider plant.
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Yes...Ramalina farinacea
No...try another key.
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