isidium

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noun

A vegetative reproductive structure present in some lichens; an outgrowth of the thallus surface, usually with a columnar structure, and consisting of both fungal hyphae and algal cells.

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Meanings

nounisidium (plural isidia)

plural isidia

  1. biologyA vegetative reproductive structure present in some lichens; an outgrowth of the thallus surface, usually with a columnar structure, and consisting of both fungal hyphae and algal cells.

Origin

According to OED, from a genus name Isidium (Acharius 1798), itself from the goddess Isis.

Full word history & related roots →

Translations

Dutch isidium
  • isidiumreproductive structure
Cite this entry
APA

isidium. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/isidium

MLA

“isidium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/isidium. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “isidium,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/isidium.

Source: isidium on Wiktionary, CC BY-SA 4.0.