SafePlants

Eggyolk Lichen (Candelariella)

The term "Eggyolk Lichen" commonly refers to various species within the genus Candelariella. These lichens are known for their vibrant yellow color, reminiscent of egg yolks.

Common Names

• Eggyolk Lichen
• Goldspeck Lichen
• Yolk Lichen
• Common Goldspeck Lichen

Taxonomy and Nomenclature

• Genus: Candelariella
• Family: Lecanoraceae / Candelariaceae
• Group: Lichen
• Symbol: CANDE3

Some species include:

• Candelariella aurella
• Candelariella arctica
• Candelariella athallina
• Candelariella vitellina (Synonym: Common Goldspeck Lichen)
• Candelariella spraguei
• Candelariella subdeflexa
• Candelariella dispersa
• Candelariella deflexa
• Candelariella efflorescens
• Candelariella reflexa
• Candelariella xanthostigma

Distribution and Habitat

Eggyolk lichens are crustose or squamulose and can be found clinging to rocks, tree bark, and old wood. Candelariella aurella is often found on calcareous surfaces. Candelariella vitellina is noted as a common lichen in Michigan and was observed on rock outcrops east of Grandview.

Morphological Characteristics

• Typically appear as bright yellow crustose lichens.
• Some species, like Candelariella xanthostigma, have a thallus consisting of minute granules (up to 0.1mm).

Quirky Facts

• One reference mentions a scientist's thwarted attempt to make a crispy lichen dish due to a lack of cured egg yolk.
• One reference notes that a Candelariella colony takes 100 years to reach the diameter of a fried egg yolk.
• Under black light, some bone-white lichens may appear a startling egg-yolk yellow.

Ecological Role

• Candelariella vitellina has moderate pollution tolerance, indicating mediocre air quality.
• These lichens often thrive under bird colonies because they need nitrogen to survive.