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Phaeophyscia

{{Short description|Genus of lichens}}

{{Automatic_taxobox

| image = Phaeophyscia orbicularis 94345191.jpg

| image_caption = Phaeophyscia orbicularis

| taxon = Phaeophyscia

| authority = Moberg (1977)

| type_species = Phaeophyscia orbicularis

| type_species_authority = (Neck.) Moberg (1977)

| synonyms_ref =

| synonyms = *Physciella Essl. (1986)

}}

Phaeophyscia is a genus of lichen-forming fungi in the family Physciaceae. These lichens typically appear as leaf-like (foliose) growths that spread across tree bark, rocks, or other surfaces, usually in well-lit, nutrient-rich environments. Their structure consists of short or long {{lichengloss|lobes}} that range in colour from pale grey to dark brown, becoming dark green when wet, and they often have dark undersides with root-like attachments (rhizines). The genus is distinguished from its relatives by its unique chemical composition and reproductive features, lacking a substance called atranorin and producing ellipsoidal spores. While some species reproduce through specialised propagules called soredia or isidia, others form small cup-like fruiting bodies (apothecia) on their surface for reproduction. There are over 50 known species of Phaeophyscia worldwide.

Taxonomy

Phaeophyscia was circumscribed by the Swedish lichenologist Roland Moberg in 1977, separating it from the older genus Physcia. The key distinction of this new genus lay in its chemical composition: unlike Physcia, Phaeophyscia lacks the substance atranorin in its outer protective layer ({{lichengloss|cortex}}) and produces ellipsoidal conidia (asexual reproductive cells). The genus can be distinguished from its close relative Physciopsis by its growth pattern, as Phaeophyscia grows more loosely on its {{lichengloss|substrate}} compared to Physciopsis{{'}}s tightly pressed form. It also differs from the genus Physconia in its spore characteristics. Moberg designated Phaeophyscia orbicularis as the type species for this new genus, establishing it as the standard reference for the group's characteristics.

Description

File:Phaeophyscia pusilloides - Flickr - pellaea.jpg

Genus Phaeophyscia encompasses a variety of lichen species, characterised by their leaf-like (foliose) structure that often extends in {{lichengloss|lobes}}, which can either be short or elongate and tend to lie flat against the {{lichengloss|substrate}}, resembling a loosely shrubby form in some instances. These lobes are typically less than 1.5 mm wide and have a range of colours from pale grey or greenish grey to dark brown, becoming dark green when moistened. The surface of these lichens is {{lichengloss|matte}}, not covered in a powdery coating ({{lichengloss|epruinose}}), and usually lacks spots ({{lichengloss|maculae}}) or fringe-like projections ({{lichengloss|cilia}}) along the edges. The underside is typically whitish or more commonly black, with matching, simple roots (rhizines) that may extend beyond the lobe tips, giving an appearance similar to cilia.

Internally, the Phaeophyscia lichen has a brown upper layer ({{lichengloss|epithecium}}), with colourless internal layers (hymenium and {{lichengloss|hypothecium}}). The supporting filamentous structures ({{lichengloss|hamathecium}}) consist of slender, often branching paraphyses with club-shaped tips that are pale brown with a thin dark brown top. The spore-producing structures (asci) are approximately cylindrical to club-shaped, containing eight spores of the Lecanora-type. The spores themselves are brown, thick-walled, and divided by a single cross-wall (1-septate), resembling those found in the genus Physcia.

Chemistry

In terms of chemical composition, Phaeophyscia lichens do not react to a solution of potassium hydroxide (K–) on the cortex and medulla, indicating the absence of atranorin. However, some species contain yellow to orange-red pigments that turn purple with potassium hydroxide (K+), known as skyrin, or terpenoids.

Reproduction

File:Phaeophyscia hirtella Essl 971765.jpg

Some Phaeophyscia species develop soredia or isidia, specialised structures (propagules) used for asexual reproduction. The upper and lower layers of the thallus (cortex) are composed of closely packed cells ({{lichengloss|pseudoparenchymatous}}), with the algal partner ({{lichengloss|photobiont}}) being {{lichengloss|trebouxioid}}–that is, from the green algal genus Trebouxia. The reproductive organs (ascomata) are cup-shaped structures (apothecia) found on the lichen's surface, usually encircled by rhizines at their base, with a brown to black {{lichengloss|disc}} that lacks a powdery covering. The rim surrounding the reproductive disc ({{lichengloss|thalline exciple}}) is smooth and occasionally lobed.

Asexual reproductive structures (conidiomata) are in the form of pycnidia, embedded within the lichen and mostly colourless, except for a brown area around the opening (ostiole). The asexual spores (conidia) are ellipsoidal in shape.

Habitat, distribution, and ecology

Ecologically, Phaeophyscia lichens favour nutrient-rich or enriched substrates in well-lit environments. They are distinguished from the closely related Hyperphyscia by their ellipsoidal, not thread-like, conidia, while Physcia species have rod-shaped ({{lichengloss|bacilliform}}) conidia.

Seventeen species of Phaeophyscia have been reported from South Korea.

Uses

Because of its ability to bioaccumulate heavy metals following exposure to pollution, Phaeophyscia hispidula has been used in several air quality biomonitoring studies in India, where it is abundant and widespread.

Species

{{As of|2025|May}}, Species Fungorum (in the Catalogue of Life) accept 26 species of Phaeophyscia, although many more have been described in the genus.

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References

{{Reflist|colwidth=30em|refs=

{{cite journal |last1=Aptroot |first1=A. |last2=Sipman |first2=H. |year=1991 |title=New lichens and lichen records from New Guinea |journal=Willdenowia |volume=20 |pages=221–256}}

{{cite book |last1=Cannon |first1=P. |last2=Thüs |first2=H. |last3=Aptroot |first3=A. |last4=Coppins |first4=B. |last5=Orange |first5=A. |last6=Sanderson |first6=N. |last7=Simkin |first7=J. |year=2022 |title=Caliciales: Physciaceae, including the genera Anaptychia, Heterodermia, Hyperphyscia, Mischoblastia, Phaeophyscia, Physcia, Physciella, Physconia, Rinodina and Tornabea |series=Revisions of British and Irish Lichens |volume=24 |page=9 |url=https://britishlichensociety.org.uk/sites/default/files/Physciaceae%201.pdf}}

{{Catalogue of Life |id=CDW9H |title=Phaeophyscia |access-date=27 May 2025}}

{{cite journal |last=Esslinger |first=T.L. |year=1978 |title=Studies in the lichen family Physciaceae. II The genus Phaeophyscia in North America |journal=Mycotaxon |volume=7 |issue=2 |pages=283–320}}

{{cite journal |last=Esslinger |first=T.L. |year=1978b |title=Studies in the lichen family Physciaceae. III. A new species of Phaeophyscia from Hawaii |journal=Mycologia |volume=70 |issue=6 |pages=1247–1249}}

{{cite journal |last1=Esslinger |first1=Theodore L. |title=Studies in the lichen family Physciaceae. VII. The new genus Physciella |journal=Mycologia |year=1986 |volume=78 |issue=1 |pages=92–97 |jstor=3793382 |doi=10.2307/3793382}}

{{cite journal |last1=Fayyaz |first1=Iram |last2=Afshan |first2=Najam-ul-Sehar |last3=Khalid |first3=Abdul Nasir |title=Phaeophyscia kashmirensis sp. nov. (Lecanorales, Physciaceae) from Azad Jammu and Kashmir, Pakistan |journal=The Lichenologist |volume=54 |issue=6 |year=2022 |doi=10.1017/s0024282922000275 |pages=355–361}}

{{cite journal |last1=Hu |first1=G.R. |last2=Chen |first2=J.B. |year=2003 |title=The lichen family Physciaceae (Ascomycota) in China IV. A new species of Phaeophyscia |journal=Mycosystema |volume=22 |issue=4 |pages=534–535}}

{{cite journal |last1=Liu |first1=Dong |last2=Hur |first2=Jae-Seoun |title=Revision of the lichen genus Phaeophyscia and allied atranorin absent taxa (Physciaceae) in South Korea |journal=Microorganisms |volume=7 |issue=8 |year=2019 |doi=10.3390/microorganisms7080242 |page=242 |doi-access=free|pmc=6723189 }}

{{cite journal |last1=Kondratyuk |first1=S. Y. |last2=Lőkös |first2=L. |last3=Farkas |first3=E. |last4=Woo |first4=J.J. |last5=Hur |first5=J.S. |title=Phaeophyscia esslingeri sp. nov. (Physciaceae, lichen-forming Ascomycota) – a new lichen species from Eastern Asia, with a world-wide key to the hairy species of the genus |journal=Studia Botanica Hungarica |volume=47 |issue=2 |year=2016 |doi=10.17110/studbot.2016.47.2.251 |pages=251–262 |url=http://real.mtak.hu/43908/1/04_Kondratyuk_et_al_01_u.pdf}}

{{cite book |last=Moberg |first=R. |title=The lichen genus Physcia and allied genera in Fennoscandia |series=Symbolae Botanicae Upsalienses |year=1977 |volume=22 |issue=1 |pages=29–30}}

{{cite journal |last=Moberg |first=R. |year=1983 |title=The genus Phaeophyscia in East Africa |journal=Nordic Journal of Botany |volume=3 |issue=4 |pages=509–516}}

{{cite journal |last1=Niazi |first1=Abdul Rehman |last2=Afshan |first2=Najam-ul-Sehar |last3=Naseer |first3=Arooj |last4=Nadeem |first4=Muhammad |last5=Iftikhar |first5=Fatima |last6=Fayyaz |first6=Iram |last7=Ashraf |first7=Asma |last8=Imtiaz |first8=Sawera |last9=Fatima |first9=Shahzadi Qamar |last10=Khalid |first10=Abdul Nasir |title=Phaeophyscia kaghanensis Niazi, Nadeem, Afshan & Khalid 2023, sp. nov. |journal=Cryptogamie, Mycologie |volume=44 |issue=4 |pages=51–59 |doi=10.5252/cryptogamie-mycologie2023v44a4}}

{{cite journal |last1=Rani |first1=Manju |last2=Shukla |first2=Vertika |last3=Upreti |first3=D.K. |last4=Rajwar |first4=G.S. |title=Periodical monitoring with lichen, Phaeophyscia hispidula (Ach.) Moberg in Dehradun city, Uttarakhand, India |journal=The Environmentalist |volume=31 |issue=4 |year=2011 |doi=10.1007/s10669-011-9349-2 |pages=376–381}}

{{cite journal |last1=Shukla |first1=Vertika |last2=Upreti |first2=D.K. |year=2007 |title=Heavy metal accumulation in Phaeophyscia hispidula en route to Badrinath, Uttaranchal, India |journal=Environmental Monitoring and Assessment |volume=131 |pages=365–369 |doi=10.1007/s10661-006-9481-5}}

{{cite journal |last1=Shukla |first1=Vertika |last2=Upreti |first2=Dalip K. |title=Physiological response of the lichen Phaeophyscia hispidula (Ach.) Essl., to the urban environment of Pauri and Srinagar (Garhwal), Himalayas, India |journal=Environmental Pollution |volume=150 | issue=3 |year=2007 |doi=10.1016/j.envpol.2007.02.010 |pages=295–299}}

{{cite journal |last1=Shukla |first1=Vertika |last2=Upreti |first2=D. K. |title=Polycyclic aromatic hydrocarbon (PAH) accumulation in lichen, Phaeophyscia hispidula of DehraDun City, Garhwal Himalayas |journal=Environmental Monitoring and Assessment |volume=149 |issue=1-4 |year=2008 |doi=10.1007/s10661-008-0225-6 |pages=1–7}}

{{cite journal |last=Urbanavichus |first=G.P. |year=2016 |title=Phaeophyscia dagestanica (Physciaceae), a new lichen species from Eastern Caucasus (Inner-mountain Dagestan, Russia) |journal=Botanicheskii Zhurnal (St. Petersburg) |volume=101 |issue=7 |pages=810–814}}

{{cite web |title=Phaeophyscia Moberg 1977 |url=http://www.mycobank.org/MycoTaxo.aspx?Link=T&Rec=3939 |publisher=MycoBank. International Mycological Association |accessdate=2011-11-21}}

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Category:Caliciales

Category:Lichen genera

Category:Caliciales genera

Category:Taxa described in 1977

Category:Taxa named by Roland Moberg