Halospora

Halospora
Scientific classification Edit this classification
Kingdom: Fungi
Division: Ascomycota
Class: Eurotiomycetes
Order: Verrucariales
Family: Verrucariaceae
Genus: Halospora
(Zschacke) Tomas. & Cif. (1952)
Type species
Halospora deminuta
(Arnold) Tomas. & Cif. (1952)
Species

H. deminuta
H. discrepans
H. scammoeca

Synonyms[1]
  • Polyblastia subgen. Halospora Zschacke (1914)

Halospora is a genus of lichenicolous (lichen-dwelling) fungi in the family Verrucariaceae.[2] Species in the genus parasitise calcicolous crustose lichens, i.e., those that prefer lime-rich substrates.[3]

Taxonomy

The grouping was first proposed in 1914 by German lichenologist Georg Hermann Zschacke as a subgenus of Polyblastia.[4] Ruggero Tomaselli and Raffaele Ciferri promoted it to generic status in 1952, with Halospora deminuta as the type species.[5] In 2002, Roux and colleagues proposed to place Halospora deminuta in the genus Merismatium.[6] In 2011, Josef Hafellner resurrected the genus Halospora for use with former Merismatium and Polyblastia species with thick-walled ascospores and a distinct perispore (a colorless, often gelatinous layer enveloping a spore) somewhat resembling a "halo". The genus name refers to this characteristic feature. Hafellner retained species with thin-walled, non-halonate ascospores in Merismatium.[3]

Description

Halospora fungi are immersed in the thallus of their host and are not externally visible. For this reason they are often unnoticed, even when the host lichen is examined or collected by experts. The fungi produce immersed to partially immersed, black perithecioid ascomata that are 150–300 μm wide. Their asci contains eight spores, are more or less cylindrical to slightly club-shaped (clavate), and measure 50–95 by 15–35 μm. Ascospores start out somewhat brown and darken in maturity; they are roughly spherical to ellipsoid in shape, with 1 to 7 transverse septa and 0 to 2 longitudinal septa that divide the spore into internal cells, typically numbering between 4 and 12. The spores, which have dimensions of 11–35 by 7–17 μm, have thick walls, and a distinct perispore that resembles a halo when viewed microscropically.[3]

Species

The nomenclatural authority Index Fungorum accepts Merismatium deminutum as the preferred synonym for Halospora deminuta,[8] while it considers Halospora longispora (Cl.Roux & Nav.-Ros.) Hafellner (2011) to be a synonym of M. deminutum.[9]

References

  1. ^ "Synonymy. Current Name: Halospora (Zschacke) Tomas. & Cif. [as 'Holospora'], Archo. bot. ital. 28: 11 (1952)". Species Fungorum. Retrieved 13 July 2022.
  2. ^ Wijayawardene, N.N.; Hyde, K.D.; Dai, D.Q.; Sánchez-García, M.; Goto, B.T.; Saxena, R.K.; et al. (2022). "Outline of Fungi and fungus-like taxa – 2021". Mycosphere. 13 (1): 53–453. doi:10.5943/mycosphere/13/1/2. hdl:10481/76378.
  3. ^ a b c Hafellner, Josef (2011). "Halospora resurrected and segregated from Merismatium". Bibliotheca Lichenologica. 106: 75–93.
  4. ^ Zschacke, Hermann (1914). "Die mitteleuropäischen Verrucariaceen. II". Hedwigia (in German). 55: 286–324.
  5. ^ Ciferri, R.; Tomaselli, R. (1952). "Scissioni di generi di licheni sulla base delle caratteristische del fungo". Archivio Botanico Italiano (in Italian). 28: 1–15.
  6. ^ Roux, Claude; Guiedan, Cécile; Navarro-Rosinés, Pere (2002). "La position systématique de Polyblastia deminuta". Mycotaxon (in French). 84: 1–20.
  7. ^ a b c Diederich, Paul; Lawrey, James D.; Ertz, Damien (2018). "The 2018 classification and checklist of lichenicolous fungi, with 2000 non-lichenized, obligately lichenicolous taxa". The Bryologist. 121 (3): 340–425 [365]. doi:10.1639/0007-2745-121.3.340. S2CID 92396850.
  8. ^ "Record Details: Halospora deminuta (Arnold) Tomas. & Cif. [as 'Holospora'], Archo. bot. ital. 28: 11 (1952)". Index Fungorum. Retrieved 13 July 2022.
  9. ^ "Record Details: Halospora longispora (Cl. Roux & Nav.-Ros.) Hafellner, Biblthca Lichenol. 106: 89 (2011)". Index Fungorum. Retrieved 13 July 2022.

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