Helocarpaceae
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Family: Helocarpaceae
Hafellner[1]
Type genus
Helocarpon
Th.Fr.,[2]

Helocarpaceae is a family of lichen-forming fungi in the subclass Lecanoromycetidae. The family is monotypic, and contains the single genus Helocarpon.[3]

Systematics

The family is classified as incertae sedis with respect to ordinal placement in the class Lecanoromycetidae, as there is no reliable molecular data available to establish phylogenetic relationships with similar taxa.[4]

Genus Helocarpon was circumscribed by Swedish botanist Theodor Magnus Fries (1832–1913), in 1860, with Helocarpon crassipes assigned as the type species,[1] which grows over moss.[5] It was originally found in Finnmark in Norway.[6]

Joseph Hafellner in 1984 described a new monotypic family, Helocarpaceae to contain the genus Helocarpon.[1][7] Then Eriksson et al in 2004, placed Helocarpon as a genus within the Micareaceae family,[8] along with genera; Micarea, Psilolechia, Roccellinastrum and Scutula.[9]

In 2005, molecular phylogeny based on mitochondrial rDNA sequences showed that the genus was not related to the Micareaceae family.[10] Helocarpaceae was re-instated to hold the genus Helocarpon.[11]

Distribution

The 2 species in the genus have a Holarctic distribution, as they are mainly found in northern temperate regions, especially in Europe,[12][13] including Switzerland,[14] Slovakia,[15] Italy, Norway, Finland, Sweden, Russia, Greenland,[16] and Australia.[17]

Helocarpon crassipes is also found in Japan.[18]

They are also found in North America in the coastal forests of Oregon, USA.[19] Helocarpon lesdainii has been found on Picea sitchensis trees in Harris Beach State Park, Oregon.[20]

Description

Helocarpaceae species are crustose lichens,[14] with tube-like amyloid structures.[17]

The genera are generally distinguished by a crustose thallus and chlorococcoid photobiont (relating to green algae of the genus Chlorococcum). They are usually immarginate (not having a distinctive margin or border) and convex biatorine apothecia. When the margin of the spore body is pale or colorless, it is called biatorine. They also have a poorly developed proper exciple (margin), simple or sparsely branched to abundantly branched and anastomosed (connected) paraphyses (the erect sterile filaments often occurring among the reproductive organs).[10] The asci has an apical cushion surrounded by a tube-structure,[17] colourless and simple (ellipsoid or tear-shaped) to transversely septate asco-spores which are lacking perispore (outer covering of a spore). They have immersed (surrounded), sessile or stalked pycnidia (asexual fruiting body), and an abundance of conidial types.[10]

Species

As of November 2021, Species Fungorum accepts two species of Helocarpon;[21]

  • Helocarpon crassipes Th. Fr. (1860)
  • Helocarpon lesdainii (Zahlbr.) Breuss (2001)[19]

Former species;[21]

  • H. arcticum (Sommerf.) M. Choisy (1950) = Frutidella caesioatra, Lecanoraceae family
  • H. gelatinosum (Flörke) M. Choisy (1950) = Trapeliopsis gelatinosa, Trapeliaceae
  • H. granulosum (Hoffm.) M. Choisy (1950) = Trapeliopsis granulosa, Trapeliaceae
  • H. granulosum f. escharoides (Hoffm.) M. Choisy (1950) = Trapeliopsis gelatinosa, Trapeliaceae
  • H. sapineum (Fr.) M. Choisy (1950) = Trapeliopsis granulosa, Trapeliaceae
  • H. viridescens (J.F. Gmel.) M. Choisy (1950) = Trapeliopsis viridescens, Trapeliaceae

References

  1. 1 2 3 Beih. Nova Hedwigia 79: 285 (1984)
  2. ↑ Nova Acta Regiae Soc. Sci. Upsal., Ser. 3, 3: 278 (1860)
  3. ↑ Wijayawardene, Nalin; Hyde, Kevin; Al-Ani, Laith Khalil Tawfeeq; Somayeh, Dolatabadi; Stadler, Marc; Haelewaters, Danny; et al. (2020). "Outline of Fungi and fungus-like taxa". Mycosphere. 11: 1060–1456. doi:10.5943/mycosphere/11/1/8. hdl:10481/61998.
  4. ↑ "CNALH Taxonomy Display: Helocarpaceae". lichenportal.org. Retrieved 10 January 2023.
  5. ↑ "CNALH – Helocarpon crassipes". lichenportal.org. Retrieved 10 January 2023.
  6. ↑ "Original material of Helocarpon crassipes Th.Fr. [family LECANOROMYCETES]". JSTOR Global Plants. 28 November 2014.
  7. ↑ D. L. Hawksworth Family Names (1989), p. 35, at Google Books
  8. ↑ P. F. Cannon and P. M. Kirk (Editors) Fungal Families of the World (2007), p. 445, at Google Books
  9. ↑ Eriksson, O. E.; Baral, H.-O.; Currah, R. S.; Hansen, K.; Kurtzman, C. P.; Rambold, G.; Laessøe, T. (2004). "Outline of Ascomycota – 2004". Myconet. 10: 1–99.
  10. 1 2 3 Andersen, Heidi L.; Ekman, Stefan (January 2005). "Disintegration of the Micareaceae (lichenized Ascomycota ): molecular phylogeny based on mitochondrial rDNA sequences". Mycol. Res. The British Mycological Society. 109 (1): 21–30. doi:10.1017/S0953756204001625. PMID 15736860.
  11. ↑ Lücking, R.; Hodkinson, B.P.; Leavitt, S.D. (2016). "The 2016 classification of lichenized fungi in the Ascomycota and Basidiomycota – Approaching one thousand genera". The Bryologist. 119 (4): 361–416. doi:10.1639/0007-2745-119.4.361. S2CID 90258634.
  12. ↑ "Helocarpaceae". www.gbif.org. Retrieved 10 January 2023.
  13. ↑ Cannon PF, Kirk PM (2007). Fungal Families of the World. Wallingford: CABI. p. 36. ISBN 978-0-85199-827-5.
  14. 1 2 Beauchamp, Hélène; Vust, Mathias; Clerc, Philippe (2007). "Notes on selected terricolous crustaceous lichens of Switzerland: Distributional, ecological and Red List data". Herzogia. 20: 115–144.
  15. ↑ "Helocarpon crassipes (Lichens of Slovakia Part 2 Eiglera – Pertusaria) · iNaturalist". iNaturalist. Retrieved 10 January 2023.
  16. ↑ "Consorcio de Herbarios de Líquenes en América Latina Parámetros de Búsqueda de Colecciones". lichenportal.org. Retrieved 10 January 2023.
  17. 1 2 3 Gerhard Rambold Bibliotheca lichenologica, Volumes 34–35, A Monograph of the Saxicolous Lecideoid Lichens of Australia (excl. Tasmania) 1989, p. 23, at Google Books
  18. ↑ Dō Kenkyūkai (Hikobiakai) Hikobia, Volume 10 (1987), p. 172, at Google Books
  19. 1 2 Breuss, Othmar (2001). "Helocarpon lesdainii (Lichens, Helocarpaceae) in the Pacific Northwest". The Bryologist. 104 (4): 600–601. doi:10.1639/0007-2745(2001)104[0600:HLLHIT]2.0.CO;2. S2CID 85973693.
  20. ↑ "Helocarpon lesdainii | Oregon Digital". oregondigital.org. Retrieved 11 January 2023.
  21. 1 2 "Species Fungorum – Search Page". www.speciesfungorum.org. Retrieved 10 January 2023.
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