| Immersaria | |
|---|---|
 | |
| Immersaria athroocarpa | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Lecideales |
| Family: | Lecideaceae |
| Genus: | Immersaria Rambold & Pietschm. (1989) |
| Type species | |
| Immersaria athroocarpa (Ach.) Rambold & Pietschm. (1989) | |
Immersaria is a genus of lichen-forming fungi in the family Lecideaceae. It has eight species of crustose lichens. [1]
The genus was circumscribed in 1989 by the lichenologists Gerhard Rambold and M. Pietschmann, with Immersaria athroocarpa assigned as the type species. [2] The boundaries of Immersaria were emended in 2022 following the use of molecular phylogenetics to assess the phylogenetic relationships of species in the genus. The study led to the division of Immersaria into two distinct clades: one comprising species with lecideine apothecia and the other containing species with lecanorine apothecia. As a result, the lecanorine species previously grouped under Immersaria have now been reclassified into the newly proposed genus Lecaimmeria . [3]
The genus Immersaria presents with a crustose (crust-like) thallus that has shades ranging from yellow-brown, red-brown, orange-brown to simple brown. This crust may occasionally show a rusty colour and typically forms irregular to rectangular patches, often with a waxy, glossy finish. The edges may be dusted with a fine, white powder ( pruinose ), and the areolae (small cracked segments) can merge around a black base layer ( prothallus ), creating larger patches. The margin of the thallus might be clearly defined or sometimes non-existent. The upper part of the thallus contains an orange pigment but lacks a lower cortex ; instead, the core (medulla) is packed with grey granules . The layer containing the algae is uninterrupted, ensuring the lichen's ability to photosynthesise. [3]
The apothecia (fruiting bodies) are of the lecideine type, meaning they are generally sunken into the thallus and can range from round to irregular in shape. The disc of these structures is typically black and flat or slightly concave, with a reduced margin that is sometimes faintly elevated but often not well defined, and it may or may not be pruinose. The exciple (the rim surrounding the apothecium) is nearly non-existent or sometimes developed and brown. [3]
Inside the apothecia, the hymenium (spore-producing layer) is colourless, with simple paraphyses (filament-like structures) that may branch rarely, with possible connections (anastomosing). The epihymenium (uppermost layer) varies from brown to green or a mix of both, sitting atop a colourless or pale brown subhymenium , with the hypothecium (the tissue below the hymenium) ranging from pale brown to darker brown. [3]
The asci (spore sacs) of Immersaria are of the Porpidia -type, cylindrical and typically contain eight spores, which are ellipsoid and surrounded by a clear halo ( halonate ) but do not turn blue-black (non-amyloid) when stained. Pycnidia (structures producing asexual spores or conidia) may or may not be present and are submerged within the thallus, linear or star-shaped, black, and often with a pruinose margin; the conidia themselves are rod-shaped ( bacilliform ). [3]
Psora is a genus of lichen-forming fungi in the family Psoraceae. Members of the genus are commonly called fishscale lichens. Lichens in the genus Psora generally have a squamulose thallus and anthraquinones in the hymenium. Photobiont partners of Psora lichens include members of the green algal genera Asterochloris, Chloroidium, Myrmecia, and Trebouxia.
Sarcogyne is a genus of crustose lichens in the family Acarosporaceae. It was circumscribed by German botanist Julius von Flotow in 1850. A proposal has been put forth in 2021 to assign Sarcogyne clavus as the type species of the genus, "as it represents the original concept of Sarcogyne as having melanized lecideine apothecia without algae in the margin".
Diploschistes is a genus of lichen-forming fungi in the family Graphidaceae. Commonly known as crater lichens, members of the genus are crustose lichens with a thick, cracked (areolate) body (thallus) with worldwide distribution. The fruiting part (apothecia) are immersed in the thick thallus so as to have the appearance of being small "craters". The widespread genus contains about 43 species.
Buellia is a genus of mostly lichen-forming fungi in the family Caliciaceae. The fungi are usually part of a crustose lichen. In this case, the lichen species is given the same name as the fungus. But members may also grow as parasites on lichens (lichenicolous). The algae in the lichen is always a member of the genus Trebouxia.
Roccella is a genus of 23 species of lichens in the family Roccellaceae. The genus was circumscribed by Swiss botanist Augustin Pyramus de Candolle in 1805, with Roccella fuciformis as the type species.
The Lecideaceae are a family of lichen-forming fungi in the order Lecideales. It contains about 30 genera and roughly 250 species. A major distinguishing characteristic of the family is the lecanoroid form of the fruiting bodies: typically circular, dark, and without a thalline margin. Most species in the family are lichenised with green algae, although a few species, scattered amongst several genera, are lichenicolous—they live on other lichens. Lecideaceae lichens tend to grow on rocks, wood, and soil. Several Lecideaceae species accelerate the weathering of rock surfaces, a process known as pedogenesis, by extending their hyphae into cracks and expelling rock flakes. This contributes to significantly faster weathering rates in certain environments, impacts various materials from natural rocks to man-made Sekishu roof tiles, and involves key biomolecules identified for survival and biodeterioration, including compounds to withstand intense ultraviolet radiation.
Baidera is a single-species fungal genus in the family Roccellaceae. It contains the species Baidera mauritiana, a corticolous (bark-dwelling), crustose lichen found in Mauritius. Both the genus and species were described as new to science in 2020 by Paul Diederich and Damien Ernst. The genus name honours Cláudia Baider, curator of the Mauritius Herbarium.
Buellia peregrina is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. It is found in the Namib desert in Namibia.
Upretia is a genus of lichen-forming fungi in the family Teloschistaceae. It has three species of saxicolous (rock-dwelling), crustose lichens. Upretia is characterised by its small ascospores and narrow, rod-shaped conidia. The distribution of the genus ranges from mid-altitude rocky terrains in India to both arid and higher altitudinal environments in China.
Lecidea lygommella is a species of saxicolous (rock-dwelling), crustose lichen in the family Lecideaceae. It spreads up to 7 cm wide with a thin thallus varying in colour from whitish and pale grey to rusty red-brown, featuring areolate surfaces with irregularly shaped areoles. Its fruiting bodies range from slightly embedded to sitting atop the thallus and black, flat to slightly convex apothecial discs. Unlike its lookalike Lecidea lygomma, L. lygommella does not produce any secondary chemicals. It is found in New South Wales and Victoria, Australia, where it grows on rocks in alpine areas.
Placolecis kunmingensis is a species of saxicolous (rock-dwelling), crustose lichen in the family Catillariaceae. It is found in Yunnan, China. The lichen is characterised by a thallus that is areolate to squamulose in its centre, forming irregular patches or clumps 10–50 mm wide, as well as its ellipsoid or spherical ascospores with slightly thickened wall.
Upretia squamulosa is a species of saxicolous (rock-dwelling), squamulose (scaly) lichen in the family Teloschistaceae. It was identified as a new species in 2019 from specimens collected in the arid valley of the Jinsha River in Yunnan, China.
Buellia phillipensis is a little-known species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae, described in 2020. It is only known to occur on Phillip Island in the Southwest Pacific.
Amandinea pilbarensis is a little-known species of crustose lichen in the family Physciaceae, First described in 2020, it is found in Australia. It is similar to Amandinea polyxanthonica, but can be distinguished by its smaller ascospores and the presence of calcium oxalate and thiophanic acid in the medulla.
Oxneriopsis is a genus of lichen-forming fungi in the family Teloschistaceae. It has four species of corticolous (bark-dwelling), crustose lichens.
Nitidochapsa is a genus of lichen-forming fungi in the family Graphidaceae. It has five species of corticolous (bark-dwelling), crustose lichens.
Glaucomaria is a genus of lichen-forming fungi in the family Lecanoraceae. It has seven species. The genus was circumscribed by Maurice Choisy in 1929. It contains crustose lichens formerly placed in the Lecanora rupicola species complex as defined by several previous authors.
Yoshimuria is a genus of lichen-forming fungi in the family Teloschistaceae. It has four species of crustose lichens.
Buellia subalbula is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. It occurs in coastal southern Africa, South America, and Australia, where it grows on calcareous rocks.
Lecidea toensbergii is a species of saxicolous (rock-dwelling), crustose lichen in the family Lecideaceae. Described as a new species in 2018, it has been documented from several locations in Norway and a single location in Sweden, where it grows in rocky alpine environments.