Ephebe (lichen)
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''Ephebe'' is a
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 ...
of
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 ...
-forming
fungi 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
Lichinaceae The Lichinaceae are a family of ascomycete fungi. Most species are lichenized with cyanobacteria, and have a distribution largely in temperate regions. Taxonomy The family was circumscribed in 1854 by Finnish lichenologist William Nylander. H ...
. These lichens form dark, hair-like mats that spread across rocks and tree bark, resembling tangled black wool. Unlike many other lichens, ''Ephebe'' species partner with
blue-green algae 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 cyanobacteria' ...
that can capture nitrogen from the air. The genus contains thirteen recognized species found in various parts of the world, from
temperate In geography, the temperate climates of Earth occur in the middle latitudes (approximately 23.5° to 66.5° N/S of the Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ran ...
regions to more
tropical The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...
areas.


Taxonomy

''Ephebe'' was
circumscribed In geometry, a circumscribed circle for a set of points is a circle passing through each of them. Such a circle is said to ''circumscribe'' the points or a polygon formed from them; such a polygon is said to be ''inscribed'' in the circle. * Circum ...
by
Elias Magnus Fries Elias Magnus Fries (15 August 1794 – 8 February 1878) was a Swedish mycologist and botanist. He is sometimes called the Mycology, "Linnaeus of Mycology". In his works he described and assigned botanical names to hundreds of fungus and li ...
in 1825. In his original description, Fries characterized the genus as having a filamentous
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 ...
with cylindrical, thread-like branches bearing small punctate structures arranged in rings on swollen nodules. At the time of publication, Fries had not yet observed the reproductive structures (
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 ...
) but predicted they would be scattered and superficial with a thalline . He noted the genus's relationship to other
filamentous lichen Lichens are symbiotic organisms made up of multiple species: a fungus, one or more photobionts (an alga and/or a cyanobacteria) and sometimes a yeast. They are regularly grouped by their external appearance – a characteristic known as their gro ...
s and referenced its connection to '' Cenogonium'' within the Byssaceae, a family name now considered
invalid Invalid may refer to: * Patient, a sick person * one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically incorrect term) * Invalid (film), a 2023 Slovak black comedy movie * .invalid, a top-l ...
. Although Fries did not indicate a
type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...
for the genus,
Frederic Clements Frederic Edward Clements (September 16, 1874 – July 26, 1945) was an American plant ecologist and pioneer in the study of both plant ecology and vegetation succession. Biography Born in Lincoln, Nebraska, he studied botany at the University o ...
and
Cornelius Lott Shear Cornelius Lott Shear (March 26, 1865 February 2, 1956) was an American mycology, mycologist and plant pathologist who served as a senior pathologist at the USDA Bureau of Plant Industry. Born in Coeyman's Hollow, Albany County, New York, on Mar ...
later designated ''
Ephebe lanata ''Ephebe lanata'' is a species of filamentous lichen in the family Lichinaceae, and the type species of the genus ''Ephebe''. The lichen was first described as a new species by Swedish taxonomist Carl Linnaeus in his seminal 1753 work ''Species ...
'' as the type. Current taxonomic opinion suggests that the genus is
monophyletic In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...
(original from a single common ancestor).


Description

''Ephebe'' species form dark brown-to-black mats of fine, hair-like filaments that creep across rock and bark surfaces like a tangled carpet. Each tuft is attached at a single point by a small
holdfast Holdfast most often refers to: *Holdfast (biology), a root-like structure that anchors aquatic sessile organisms to their substrate *Holdfast (tool), a tool used to secure a workpiece to a workbench or anvil Holdfast or hold fast may also refer t ...
, then branches repeatedly to create an intricate web. Because the filaments lack a true outer skin (), the fungal threads, or
hypha A hypha (; ) is a long, branching, filamentous structure of a fungus, oomycete, or actinobacterium. In most fungi, hyphae are the main mode of vegetative growth, and are collectively called a mycelium. Structure A hypha consists of one o ...
e, lie directly on the surface; when young they surround the partner alga but later organise into a loose central strand. The algal associate is from the
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 ...
l genus '' Stigonema'', which grows as bead-like chains of cells and gives the lichen its ability to fix atmospheric nitrogen. Reproductive bodies begin as tiny flask-shaped structures called
pycnidia A pycnidium (plural pycnidia) is an asexual fruiting body produced by mitosporic fungi, for instance in the order Sphaeropsidales ( Deuteromycota, Coelomycetes) or order Pleosporales (Ascomycota, Dothideomycetes). It is often spherical or inve ...
and mature into disc-shaped
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 sit flush with the filament surface. The are minute pin-pricks, ringed by a true fungal rim but not by thallus tissue. Inside, the spore layer is jelly-like; its upper portion turns brown and reacts iodine-positive (blue-green) in chemical tests, a useful identification clue. Slender supporting threads (
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 ...
) line the cavity, their tips slightly swollen. Each spore sac (
ascus An ascus (; : asci) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some gen ...
) is cylindrical to club-shaped, has a thin wall that
stains A stain is an unwanted localized discoloration, often in fabrics or textiles. Stain(s) or The Stain(s) may also refer to: Color * Stain (heraldry), a non-standard tincture * Staining, in biology, a technique used to highlight contrast in samples ...
blue in iodine, and typically contains eight—but sometimes up to sixteen—colourless
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. The spores lack cross-walls, though a few may show one or two "plasma bridges", internal strands that do not reach the wall.
Asexual Asexual or Asexuals may refer to: *Asexual reproduction **Asexual reproduction in starfish *Asexuality, the lack of sexual attraction to anyone or lack of interest in or desire for sexual activity. **Gray asexuality, the spectrum between asexualit ...
spores (
conidia A conidium ( ; : conidia), sometimes termed an asexual chlamydospore or chlamydoconidium (: chlamydoconidia), is an asexual, non- motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also ...
) are produced in the remaining pycnidia; they are simple, rod-to-oval bodies released from elongated, branched
conidiophore A conidium ( ; : conidia), sometimes termed an asexual chlamydospore or chlamydoconidium (: chlamydoconidia), is an Asexual reproduction, asexual, non-motility, motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word f ...
s. No
secondary metabolite Secondary metabolites, also called ''specialised metabolites'', ''secondary products'', or ''natural products'', are organic compounds produced by any lifeform, e.g. bacteria, archaea, fungi, animals, or plants, which are not directly involved ...
s have been detected with
thin-layer chromatography Thin-layer chromatography (TLC) is a chromatography technique that separates components in non-volatile mixtures. It is performed on a TLC plate made up of a non-reactive solid coated with a thin layer of adsorbent material. This is called the sta ...
, and standard spot tests on the thallus are negative.


Species

In a 2024
molecular phylogenetics 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 ...
-led reorganisation of the
Lichinomycetes Lichinales is the sole order (biology), order of ascomycete fungi in the class Lichinomycetes. It contains three family (biology), families: Gloeoheppiaceae (3 genus, genera), Lichinaceae (43 genera), and Peltulaceae (1 genus). Most species are l ...
, María Prieto and colleagues included 13 species in the genus. ,
Species Fungorum ''Index Fungorum'' is an international project to index all formal names (Binomial nomenclature, scientific names) in the fungus Kingdom (biology), kingdom. As of 2015, the project is based at the Royal Botanic Gardens, Kew, one of three partn ...
accepts 6 species of ''Ephebe''. *'' Ephebe americana'' *'' Ephebe brasiliensis'' *'' Ephebe epheboides'' *'' Ephebe fruticosa'' *''
Ephebe hispidula ''Ephebos'' (; pl. ''epheboi'', ), latinized as ephebus (pl. ephebi) and anglicised as ephebe (pl. ephebes), is a term for a male adolescent in Ancient Greece. The term was particularly used to denote one who was doing military training and pr ...
'' *'' Ephebe japonica'' *''
Ephebe lanata ''Ephebe lanata'' is a species of filamentous lichen in the family Lichinaceae, and the type species of the genus ''Ephebe''. The lichen was first described as a new species by Swedish taxonomist Carl Linnaeus in his seminal 1753 work ''Species ...
'' *'' Ephebe multispora'' *'' Ephebe ocellata'' *'' Ephebe orthogonia'' *'' Ephebe perspinulosa'' *'' Ephebe solida'' *'' Ephebe tasmanica'' *'' Ephebe trachytera''


References

{{Taxonbar, from=Q5382131 Lichinomycetes Lichinomycetes genera Lichen genera Taxa described in 1825 Taxa named by Elias Magnus Fries