| Helocarpon erraticum
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| Scientific classification
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| Kingdom:
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Fungi
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| Division:
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Ascomycota
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| Class:
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Lecanoromycetes
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| Order:
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Lecanorales
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| Family:
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Ectolechiaceae
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| Genus:
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Helocarpon
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| Species:
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H. erraticum
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| Binomial name
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Helocarpon erraticum
( Körb.) M.Svenss., Myllys & Kantel. (2026)
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| Synonyms
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- Lecidea erratica Körb. (1861)
- Biatora moestula (Nyl.) Arnold (1871)
- Biatorina expansa Arnold (1861)
- Lecidea demarginata Nyl. (1878)
- Lecidea dispansa Nyl. (1866)
- Lecidea erratica f. demarginata (Nyl.) Vain. (1934)
- Lecidea erratica f. dendroides Erichsen (1938)
- Lecidea erratica var. demarginata (Nyl.) Lettau (1912)
- Lecidea expansa Nyl. (1861)
- Lecidea expansa f. demarginata (Nyl.) Arnold (1884)
- Lecidea expansa subsp. demarginata (Nyl.) A.L.Sm. (1911)
- Lecidea expansa var. demarginata (Nyl.) A.L.Sm. (1926)
- Lecidea moestula Nyl. (1868)
- Lecidea sarcogynoides * dispansa (Nyl.) Branth & Rostr. (1869)
- Lecidea tephrizans Leight. (1878)
- Micarea erratica (Körb.) Hertel, Rambold & Pietschm. (1989)
- Leimonis erratica (Körb.) R.C.Harris & Lendemer (2009)
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Helocarpon erraticum is a species of crustose lichen in the family Ectolechiaceae. It grows mainly on siliceous rock and is a widely distributed species.