''Atrophysma'' is a fungal

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

in the family

Pannariaceae The Pannariaceae are a family of lichens in the order Peltigerales (suborder Collematineae). Species from this family have a widespread distribution, but are especially prevalent in southern temperate In geography, the temperate clima ...

. It contains the single species ''Atrophysma cyanomelanos'', a

crustose lichen Crustose lichens are lichens that form a crust which strongly adheres to the Substrate (biology), substrate (soil, rock, tree bark, etc.), making separation from the substrate impossible without destruction. The basic structure of crustose lichen ...

found only in

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

Taxonomy

Both the genus and species were described as new to science in 2020 by lichenologist

Toby Spribille Toby Spribille is a lichenologist, specialising in evolution and taxonomy. He identified the presence of yeast cells as an additional fungal component of some lichens. He works at University of Alberta and is the Canada Research Chair in Symbiosi ...

. The

type specimen In biology, a type is a particular wikt:en:specimen, specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally associated. In other words, a type is an example that serves to ancho ...

was discovered in

Glacier Bay National Park Glacier Bay National Park and Preserve is a List of national parks of the United States, national park of the United States located in Southeast Alaska west of Juneau, Alaska, Juneau. President Calvin Coolidge proclaimed the area around Glacier ...

, where it was found growing on

argillite Argillite () is a fine-grained sedimentary rock composed predominantly of Friability, indurated clay particles. Argillaceous rocks are basically lithified muds and Pelagic sediment, oozes. They contain variable amounts of silt-sized particles. T ...

rock on the top of an alpine ridge; this location is typically covered by snow for most of the year. The generic name ''Atrophysma'' combines ''atra'' ("black") and ''physma'' ("to blow up or distend"); the

specific epithet In Taxonomy (biology), taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin gramm ...

, which combines ''kyanos'' ("blue") and ''melas'' ("black"), alludes to the typical colors of the

thallus Thallus (: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. A thallus usually names the entir ...

and

ascomata An ascocarp, or ascoma (: ascomata), is the fruiting body (sporocarp (fungi), sporocarp) of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and millions of embedded ascus, asci, each of which typically contains four to ...

. The lichen had been discovered previously in a nearby location,

Klondike Gold Rush National Historical Park Klondike Gold Rush National Historical Park is a national historical park operated by the National Park Service that seeks to commemorate the Klondike Gold Rush of the late 1890s. Though the gold fields that were the ultimate goal of the stampe ...

, as part of a similar lichen research survey in that area. It had been tentatively assigned to the genus '' Santessoniella'', but not

formally described A species description is a formal scientific description of a newly encountered species, typically articulated through a scientific publication. Its purpose is to provide a clear description of a new species of organism and explain how it differ ...

as a new species. The material found at Glacier Bay National Park was more substantive, allowing for a fuller characterization of the species, as well as

molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...

analysis. This showed that the lichen belonged to a distinct

clade In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...

among other members of the Pannariaceae, and so ''Atrophysma'' was proposed to contain it.

Description

''Atrophysma cyanomelanos'' is a

cyanolichen Cyanolichens are lichens in which the fungal component () partners with cyanobacteria () for photosynthesis, rather than the green algae found in most other lichens. In some cyanolichens, known as forms, the cyanobacteria form an extensive throug ...

, meaning that it has

cyanobacteria Cyanobacteria ( ) are a group of autotrophic gram-negative bacteria that can obtain biological energy via oxygenic photosynthesis. The name "cyanobacteria" () refers to their bluish green (cyan) color, which forms the basis of cyanobacteri ...

(also known as blue-green algae) as a

photobiont A lichen ( , ) is a hybrid colony of algae or cyanobacteria living symbiotically among filaments of multiple fungus species, along with yeasts and bacteria embedded in the cortex or "skin", in a mutualistic relationship.

partner. The lichen

is an olivaceous-brown crust up to in diameter, although neighbouring thalli can coalesce to form larger entities. The thallus resembles a flattened coral with tiny finger-like lobes (measuring 70–150

μm The micrometre (Commonwealth English as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American English), also commonly known by the non-SI term micron, is a unit of length in the International System ...

in diameter) protruding through a black hypothallus. It has rounded, black

apothecia An ascocarp, or ascoma (: ascomata), is the fruiting body ( sporocarp) of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and millions of embedded asci, each of which typically contains four to eight ascospores. As ...

(sexual reproductive organs), and simple

ascospore In fungi, an ascospore is the sexual spore formed inside an ascus—the sac-like cell that defines the division Ascomycota, the largest and most diverse Division (botany), division of fungi. After two parental cell nucleus, nuclei fuse, the ascu ...

s that measure 11.0–16.0 by 7.1–8.1 μm.

References

{{Taxonbar, from=Q108628475 Lichen genera Monotypic Lecanoromycetes genera Pannariaceae Peltigerales genera Taxa described in 2020 Taxa named by Toby Spribille Fungi without expected TNC conservation status