description Physcia tenella Overview
Physcia tenella is a small foliose lichen in the family Physciaceae with pale gray, loosely attached lobes, white mottling, marginal cilia, and terminal soralia. Unlike the similar Physcia adscendens, its lobe ends are not inflated into hoods. It commonly grows on nutrient-rich bark, twigs, and tree trunks, including in urban areas, and may occur less often on walls and rocks.
help Physcia tenella FAQ
How can I recognize Physcia tenella on bark?
Physcia tenella is a small, loosely attached pale gray foliose lichen with narrow lobes, white mottling, and marginal cilia. Its lobe tips carry flat, lip-shaped terminal soralia rather than inflated hoods. [Dolichens](https://italic.units.it/dolichens/?num=1735&procedure=taxonpage)
How is Physcia tenella different from Physcia adscendens?
Physcia tenella has labriform, or lip-shaped, soralia at the lobe ends, while Physcia adscendens typically forms inflated helmet-like tips. Eroded or young specimens can be hard to separate, so a hand lens and careful look at the lobe tips matter. [British Lichen Society](https://britishlichensociety.org.uk/sites/default/files/Physciaceae.pdf)
Where does Physcia tenella usually grow?
Physcia tenella is common on bark and wood, especially in well-lit, nutrient-rich habitats, and it can also occur on stone or concrete. The species is associated with nitrophilous communities, so bird-perching sites can be productive places to look. [Association Française de Lichénologie](https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Physcia_tenella.htm)
How does Physcia tenella reproduce?
In Physcia tenella, terminal soralia produce soredia, powdery vegetative propagules that can disperse and start new lichen growth. Apothecia may also occur, but the soralia and marginal cilia are the more useful field clues. [Association Française de Lichénologie](https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_2/Physcia_tenella.htm)
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