plant · GBIF taxon 7251037
Hoary Frost Lichen
Physcia adscendensAlso known as Hooded Rosette Lichen, Hooded Physcia
Hoary frost lichens form small, pale grey rosettes that stand out against dark bark and weathered stone. Their distinctive hood-shaped lobe tips curl upward to reveal powdery reproductive structures underneath, while long, dark-tipped hairs fringe the margins. Highly tolerant of dust and nutrients, these resilient pioneers are among the first to colonize urban concrete and roadside trees.
LichenPioneer SpeciesFoliose
- diet
- Photosynthetic (via Trebouxia algae symbiont)
- family
- Physciaceae
- threats
- Heavy sulfur dioxide air pollution
- life Span
- Decades to centuries
LC
Safe to observe and touch at a normal distance.
- Look for the hoods: Use a hand lens to inspect the inflated, hood-like tips of the lobes.
- Spot the cilia: Look closely at the margins for long, pale hairs with dark tips.
- Check the substrate: Search on nutrient-rich bark of roadside trees or concrete walls.