''Abrothallus halei'' is a species of lichenicolous (

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

-dwelling)

fungus A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and mold (fungus), molds, as well as the more familiar mushrooms. These organisms are classified as one ...

in the family Abrothallaceae. It was

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 in 2010 by the lichenologists Sergio Pérez-Ortega, Ave Suija,

David Leslie Hawksworth David Leslie Hawksworth (born 1946 in Sheffield, UK) is a British mycologist and lichenologist currently with a professorship in the Universidad Complutense de Madrid in Madrid, Spain and also a Scientific Associate of The Natural History Mu ...

, and

Rolf Santesson Rolf Santesson (1916–2013) was a Swedish lichenologist and university lecturer. He was awarded the Acharius Medal in 1992 for his lifetime contributions to lichenology. Early life and education Santesson was born in 1916 in Trollhättan, Sw ...

. 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 collected by Cliff Wetmore east of Hare Lake (

Superior National Forest The Superior National Forest, part of the United States National Forest system, is located in the Arrowhead Region of the U.S. state, state of Minnesota between the Canada–United States border and the North Shore (Lake Superior), north shore o ...

Minnesota Minnesota ( ) is a U.S. state, state in the Upper Midwestern region of the United States. It is bordered by the Canadian provinces of Manitoba and Ontario to the north and east and by the U.S. states of Wisconsin to the east, Iowa to the so ...

) at an elevation of ; there it was found on the

foliose A foliose lichen is a lichen with flat, leaf-like , which are generally not firmly bonded to the substrate on which it grows. It is one of the three most common lichen growth forms, growth forms of lichens. It typically has distinct upper and lo ...

lichen '' Lobaria quercizans'', which itself was growing on the bark of ''

Acer saccharum ''Acer saccharum'', the sugar maple, is a species of flowering plant in the soapberry and lychee family Sapindaceae. It is native to the hardwood forests of eastern Canada and the eastern United States. Sugar maple is best known for being the p ...

''. The fungus has also been collected in

West Virginia West Virginia is a mountainous U.S. state, state in the Southern United States, Southern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States.The United States Census Bureau, Census Bureau and the Association of American ...

Maine Maine ( ) is a U.S. state, state in the New England region of the United States, and the northeasternmost state in the Contiguous United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Provinces and ...

, as well as in Norway. The

species epithet Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In Taxonomy (biology), taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany) ...

honours American lichenologist

Mason Hale Mason Ellsworth Hale, Jr. (September 23, 1929 – April 23, 1990) was one of the most prolific American lichenologists of the 20th century. Many of his scholarly articles focused on the taxonomy of the family Parmeliaceae. Hale was one of the fi ...

Description

''Abrothallus halei'' forms minute, dome-shaped fruiting bodies (

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 ...

) that erupt through the surface of its ''

Lobaria ''Lobaria'' is a genus of foliose lichens, formerly classified in the family Lobariaceae, but now placed in the Peltigeraceae. They are commonly known as "lung wort" or "lungmoss" as their physical shape somewhat resembles a lung, and their eco ...

'' host, most often on the lichen's own apothecia. Each measures roughly 0.2–0.55 mm across and about 0.15 mm tall and is frequently pinched in at the base so older examples look faintly stalked. When young the outer surface is cloaked in a vivid olive-green, powdery coating () that can be lost with age, exposing an underlying black wall. In vertical section the cup lacks a distinct rim, its wall being made of radiating fungal threads that surround a pale-brown supportive layer (). Above this sits the

hymenium The hymenium is the tissue layer on the hymenophore of a fungal fruiting body where the cells develop into basidia or asci, which produce spores. In some species all of the cells of the hymenium develop into basidia or asci, while in oth ...

, a spore-producing tissue about 50

micrometre The micrometre (English in the Commonwealth of Nations, 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 uni ...

s (μm) tall that is clear below but infused with olive-green pigment granules in the upper part; these granules dissolve in

potassium hydroxide Potassium hydroxide is an inorganic compound with the formula K OH, and is commonly called caustic potash. Along with sodium hydroxide (NaOH), KOH is a prototypical strong base. It has many industrial and niche applications, most of which utili ...

solution, a routine diagnostic test. Between the spore sacs run very slender, forked sterile filaments (

paraphyses Paraphyses are erect sterile filament-like support structures occurring among the reproductive apparatuses of fungi, ferns, bryophytes and some thallophytes. The singular form of the word is paraphysis. In certain fungi, they are part of the f ...

) barely 2 μm thick at the tip. The sacs themselves ( asci) are double-walled and , meaning the two walls separate like a telescope when the spores are released. They are club-shaped, 40–60 μm long by 9–12 μm wide and usually hold eight spores. The brown,

ellipsoid An ellipsoid is a surface that can be obtained from a sphere by deforming it by means of directional Scaling (geometry), scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a Surface (mathemat ...

spores are initially two-celled but mature into four-celled bodies only 9–14 μm long and 3–5 μm wide. A deep waist at the middle

septum In biology, a septum (Latin language, Latin for ''something that encloses''; septa) is a wall, dividing a Body cavity, cavity or structure into smaller ones. A cavity or structure divided in this way may be referred to as septate. Examples Hum ...

allows each mature spore to break neatly into a pair of identical two-celled "part-spores" even while still inside the ascus, a feature unique within the genus. Viewed at high magnification the spore wall is dotted with minute "warts", and no asexual reproductive stage had yet been observed.

References

{{Taxonbar, from=Q10398082 halei Fungi described in 2010 Fungi of Europe Fungi of the United States Taxa named by David Leslie Hawksworth Taxa named by Rolf Santesson Taxa named by Ave Suija Fungus species Lichenicolous fungi