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rosette lichens
Physcia
Physcia is a genus of lichen-forming fungi in the family Physciaceae. The widely distributed genus contains about 80 species. The genus is cosmopolitan, and has been extensively studied in various regions in the past several decades, with significant biodiversity in South America identified as a central diversity hotspot. Physcia species are foliose, lobate lichens that grow with a loose to close appressed habit. Their upper surface is typically whitish, pale greenish, green-grey, or dark grey in colour. The thallus colour remains relatively unchanged when moistened. Physcia lichens typically grow on bark, on wood, or rock, although they have occasionally been recorded dwelling on man-made structures. They thrive in nutrient-rich environments and are expanding rapidly in urban areas of the United Kingdom previously affected by SO2 pollution.
The main characteristics that separate Physcia from similar genera in the same order, including Dirinaria, Heterodermia, Hyperphyscia, Kashiwadia, Phaeophyscia, and Pyxine, are the distinct morphology of its ascospores (brown and two-celled), its somewhat cylindrical pycnoconidia (asexual reproductive structures), and the presence of the chemical atranorin in the upper cortex. Physcia has been divided into sections based on morphological and chemical characters, such as the presence or absence of cilia on the thallus margins and K+ (yellow) spot test reaction in the cortex.
60 branches of this genus, most-observed first
Hooded Rosette Lichen
speciesPhyscia adscendens
Star Rosette Lichen
speciesPhyscia stellaris
rosette lichen
speciesPhyscia millegrana
Hoary Rosette Lichen
speciesPhyscia aipolia
Blue-gray Rosette Lichen
speciesPhyscia caesia
Fringed Rosette Lichen
speciesPhyscia tenella
Powder-tipped Rosette Lichen
speciesPhyscia dubia
American Rosette Lichen
speciesPhyscia americana
Thomson's Rosette Lichen
speciesPhyscia thomsoniana
black-eyed rosette lichen
speciesPhyscia phaea
Lesser Gray Legs
speciesPhyscia pumilior
Frosted Rosette Lichen
speciesPhyscia biziana
Physcia leptalea
speciesPhyscia leptalea
Physcia clementei
speciesPhyscia clementei
slender rosette lichen
speciesPhyscia subtilis
Beaded Rosette Lichen
speciesPhyscia tribacia
Physcia tribacioides
speciesPhyscia tribacioides
Streaked Rosette Lichen
speciesPhyscia atrostriata
Physcia aipolioides
speciesPhyscia aipolioides
Outward-looking Rosette Lichen
speciesPhyscia alnophila
Exuberant Rosette Lichen
speciesPhyscia dimidiata
Physcia jackii
speciesPhyscia jackii
Physcia subalbinea
speciesPhyscia subalbinea
Physcia undulata
speciesPhyscia undulata
Physcia poncinsii
speciesPhyscia poncinsii
Hale's Rosette Lichen
speciesPhyscia halei
Physcia neogaea
speciesPhyscia neogaea
Physcia orientalis
speciesPhyscia orientalis
Black-bottomed Rosette
speciesPhyscia sorediosa
Physcia mediterranea
speciesPhyscia mediterranea
Physcia erumpens
speciesPhyscia erumpens
Physcia teretiuscula
speciesPhyscia teretiuscula
Physcia albinea
speciesPhyscia albinea
Physcia crispa
speciesPhyscia crispa
Physcia vitii
speciesPhyscia vitii
Physcia pseudospeciosa
speciesPhyscia pseudospeciosa
Physcia krogiae
speciesPhyscia krogiae
Physcia dakotensis
speciesPhyscia dakotensis
Physcia magnussonii
speciesPhyscia magnussonii
Physcia albata
speciesPhyscia albata
Physcia austrostellaris
speciesPhyscia austrostellaris
Physcia austrocaesia
speciesPhyscia austrocaesia
Physcia nubila
speciesPhyscia nubila
Physcia tenellula
speciesPhyscia tenellula
Physcia rolandii
speciesPhyscia rolandii
Physcia sinuosa
speciesPhyscia sinuosa
Physcia integrata
speciesPhyscia integrata
Physcia decorticata
speciesPhyscia decorticata
Physcia verdonii
speciesPhyscia verdonii
Physcia occidentalis
speciesPhyscia occidentalis
Physcia verrucosa
speciesPhyscia verrucosa
Physcia duplicorticata
speciesPhyscia duplicorticata
Physcia montana
speciesPhyscia montana
Physcia nashii
speciesPhyscia nashii
Physcia neglecta
speciesPhyscia neglecta
Physcia synthalea
speciesPhyscia synthalea
Physcia solistella
speciesPhyscia solistella
Physcia convexella
speciesPhyscia convexella
Physcia villosula
speciesPhyscia villosula
Physcia venustula
speciesPhyscia venustula
Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
Drag the globe to turn it. Dots are where records exist, not a range map; darker means more records.
In the stacks
Searching the stacks…
Every page naming Physcia in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 117887.