| Graphis halonata | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Graphidales |
| Family: | Graphidaceae |
| Genus: | Graphis |
| Species: | G. halonata |
| Binomial name | |
| Graphis halonata | |
Graphis halonata is a species of lichen in the family Graphidaceae, [1] first described in 2018. It is found in Brazil. The species is distinguished by its saxicolous (rock-dwelling) habitat, presence of norstictic acid , and unique ascospore characteristics. [2]
Graphis halonata was formally described by the lichenologists Klaus Kalb and André Aptroot in 2018. The type specimen was collected in the Serra do Espinhaco, specifically Serra do Caraça , Bocaina, Minas Gerais, Brazil, on a sandstone boulder at an altitude of 1,450 m (4,760 ft). The specific epithet halonata refers to the characteristic halonate (halo-like) ascospores found in this species. [2]
The thallus of Graphis halonata is saxicolous , crustose , discontinuous and uneven. It lacks a cortex , is dull and ochraceous white, measuring up to 0.2 mm thick, and is not surrounded by a prothallus . The photobiont is trentepohlioid . Ascomata are erumpent from the thallus, completely carbonized , not striate, wavy linear, irregularly branched and partly divided into separate discs, measuring 0.5–2.5 mm long, about 0.4 mm wide, and approximately 0.3 mm high. The rim is black, and the thalline margin is lateral and ochraceous white. The hamathecium is 100–125 μm high and not inspersed . Ascospores , which number eight per ascus , are hyaline, IKI+ (violet), and broadly ellipsoid in shape. These spores are muriform (i.e., divided into lumina or locules by intersecting 3–5 longitudinal and 0–3 transverse septa), measuring 18–26 by 12–15 μm, surrounded by a gelatinous sheath about 5 μm wide, with lumina arranged somewhat spirally. Pycnidia were not observed. [2]
Chemical spot tests show that the thallus and thalline margin of the apothecia are UV−, C−, P−, and K+ (yellow turning red). Thin-layer chromatography analysis shows the presence of norstictic and connorstictic acids. [2]
Graphis halonata was found on a free-standing sandstone boulder and at the time of original publication was known only from Brazil. [2]
Diorygma microsporum is a species of corticolous (bark-dwelling) crustose lichen in the family Graphidaceae. It was described as new to science in 2011. It has a neotropical distribution, and has been collected in Florida, Colombia, Brazil, and India. Notable for its small ascospores, this lichen thrives in undisturbed rainforests and serves as an indicator of forest health.
Graphis crebra is a species of corticolous lichen in the family Graphidaceae. It has a pantropical distribution. Like other script lichens, it grows on bark and resembles calligraphy. It can be distinguished from several other similar species by the white pruina (powder) on its apothecial discs.
Lecanora sanctae-helenae is a species of saxicolous (rock-dwelling), crustose lichen in the family Lecanoraceae. It was formally described as a new species in 1893 by Swiss botanist Johannes Müller Argoviensis, from specimens collected in Saint Helena Island by British amateur naturalist John Charles Melliss. The type locality is referenced in the species epithet. More than a century later, it was accepted in a 1995 revision of the species complex related to Lecanora subcarnea. For decades it was thought to be endemic to this island, where it occurs on siliceous rocks. It was reported from Ascension Island in 2008, where it is locally common.
Allographa pedunculata is a species of script lichen in the family Graphidaceae, discovered in the Galápagos Islands. The species is characterized by its distinctly stalked lirellae and contains norstictic acid. It is similar to other species in the Graphis nuda species complex but has the longest ascospores in the group.
Gyalecta perithecioidea is a little-known species of saxicolous (rock-dwelling), crustose lichen in the family Gyalectaceae. It is found in Brazil, where it grows on sheltered limestone in the Atlantic Forest.
Allographa grandis is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae. Found in Cameroon, it is characterised its large ascomata and ascospores, and an inspersed hymenium.
Maronora is a monotypic fungal genus in the family Fuscideaceae. It contains the single species Maronora cyanosora, a corticolous (bark-dwelling) lichen. It is characterised by its distinctive bluish-grey circular soralia on the thallus, Lecanora-like apothecia, and simple, hyaline ascospores.
Astrothelium miniannulare is a species of crustose lichen in the family Trypetheliaceae, characterized by its corticolous (bark-dwelling) habitat and presence of lichexanthone. Characteristics of the lichen include the whitish ring around its ostiole and the presence of three septa in the ascospores.
Cratiria sorediata is a species of corticolous (bark-dwelling), crustose lichen in the family Caliciaceae. It was first described as a new species in 2009. The type specimen was collected from Aldabra in the Seychelles.
Xanthoparmelia somervilleae is a species of saxicolous (rock-dwelling), foliose lichen in the family Parmeliaceae. It is found in Tasmania, Australia.
Eilifdahlia sergeyana is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. It is endemic to Kangaroo Island in South Australia. The lichen thallus has an uneven and scaly texture, forming patches up to 40 mm wide in dull greenish-grey or brownish-grey. Its fruiting bodies (apothecia) are orange to yellow, with a biatorine structure, and range from 0.5 to 1 mm wide. These apothecia have a matte surface and a cup-shaped margin containing golden-yellow crystals. The paraphyses within are slender and branched, and the asci contain ellipsoid spores.
Allographa anguilliradians is a species of corticolous (bark-dwelling), crustose lichen in the family Graphidaceae. It has been found in Trinidad and Tobago and Central-West Brazil. Its thallus covers an area of 3 to 7 cm in diameter with a slim profile and a variable surface texture, with a distinct metallic pale grey-olive colour without a prothallus. Its reproductive structures, known as lirellae, form a star-like pattern with black, carbonised outer layers and clear, colourless hymenium, while its ascospores are oblong and segmented, reacting violet-blue to iodine-based stains.
Lecanactis malmideoides is a little-known species of corticolous (bark-dwelling), crustose lichen in the family Roccellaceae. First described in 2018, it is found in Brazil. Characteristics of the lichen include its pruinosediscs, thin and glossy black margins, and ascospore structure.
Rinodina densisidiata is a little-known species of corticolous (bark-dwelling), crustose lichen in the family Physciaceae, first described in 2018. Found in Brazil, it is characterised its dense layer of cylindrical isidia and unique ascospore characteristics.
Rinodina maronisidiata is a species of corticolous (bark-dwelling), crustose lichen in the family Physciaceae, first described in 2018. Found at high altitudes in the Venezuelan Andes, it is characterised by its unique isidia-covered thallus and specific ascospore morphology.
Astrothelium trematum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first described in 2018. Found only in Brazil, it is characterised by its lack of lichexanthone and pigments, and distinctive ascospores.
Allographa hypostictica is a species of saxicolous (rock-dwelling), crustose lichen in the family Graphidaceae, Found in Brazil, it was described as a new species in 2018. Its thallus contains hypostictic acid and its distinctive apothecia and ascospores.
Astrothelium rubrocrystallinum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first described in 2016. It is found in Brazil.
Enterographa aldabrensis is a species of corticolous (bark-dwelling), crustose lichen in the family Roccellaceae. It is only known to occur in Aldabra in the Seychelles.
Graphis paraschiffneri is a little-known species of corticolous (bark-dwelling) script lichen in the family Graphidaceae. It is only known to occur in Nicaragua. Closely related to Graphis schiffneri, the lichen is distinguished from this lookalike by its longer ascospores with more septa and extended lirellae.