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Sporodictyon

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Sporodictyon
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Eurotiomycetes
Order: Verrucariales
Family: Verrucariaceae
Genus: Sporodictyon
A.Massal. (1852)
Type species
Sporodictyon schaererianum
A.Massal. (1852)

Sporodictyon is a genus of crustose lichens in the family Verrucariaceae.[1] It has 10 species. Most species grow on rocks, although some have been recorded overgrowing soil and mosses.[2]

Taxonomy

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The genus was circumscribed in 1852 by Italian lichenologist Abramo Bartolommeo Massalongo, with Sporodictyon schaererianum assigned as the type species.[3] Until fairly recently, the genus was usually included in Polyblastia, which is a conserved name. As a result of molecular phylogenetic work published in 2008, the genus was resurrected by Sanja Savić and Leif Tibell for three species that formed a monophyletic clade, and which included the type species: S. cruentum, S. schaererianum, and S. terrestre.[4] Several molecular phylogenetic-based publications have shown that characters traditionally used to separate taxa in the Verrucariaceae, namely spore septation and growth form, are not always reliable for representing monophyletic groups at generic and higher ranks. Historically, descriptions of Sprodictyon species have relied heavily on the following characters: thallus development, size of perithecia, structure of the involucrellum (the upper, often exposed covering external to the excipulum), and the size and colour of ascospores. However, the morphological variability of species, and sometimes ambiguous generic concepts means that the taxonomy of this group of species has been difficult. Following the molecular work, Savić and Tibell found that ascoma size, spore pigmentation, spore size, and thallus structure are the most useful features for species recognition in Sporodictyon.[2]

Description

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Sprodictyon lichens have a grey, greenish grey or brownish crust-like thallus of variable thickness. The perithecia measure 0.4–1.1 mm in diameter, and are hemispherical. The involucrellum is well developed, and is fused to the excipulum in its upper parts. The asci are variably sized (even in the same specimen), with reported dimension ranging from 105 to 236 by 34–118 μm; they typically have eight spores (although sometimes contain fewer). Ascospores are ellipsoidal, to curved with one wider end, to ovoid; they measure 39–84 by 19–47 μm. The colour of mature spores ranges from yellowish to medium brown to dark brown. Spore are muriform, meaning they are divided into smaller internal compartment by transverse and longitudinal septa.[2]

Species

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As of July 2022, Species Fungorum (in the Catalogue of Life) accepts 10 species of Sprodictyon.[5]

These are species that were formerly in Sporodictyon, but are now classified in other genera:

Sporodictyon clandestinum Arnold (1871)[18] was shown to be part of the largely unresolved Thelidium clade.[2]

References

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  1. ^ 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. S2CID 249054641.
  2. ^ a b c d e f Savić, Sanja; Tibell, Leif (2009). "Taxonomy and species delimitation in Sporodictyon (Verrucariaceae) in Northern Europe and the adjacent Arctic-reconciling molecular and morphological data". Taxon. 58 (2): 585–605. doi:10.1002/tax.582022.
  3. ^ a b Massalongo, A. (1852). "Sporodictyon, novum Lichenum genus". Flora (Regensburg) (in Latin). 35 (21): 321–328.
  4. ^ Savić, Sanja; Tibell, Leif; Gueidan, Cécile; Lutzoni, François (2008). "Molecular phylogeny and systematics of Polyblastia (Verrucariaceae, Eurotiomycetes) and allied genera". Mycological Research. 112 (11): 1307–1318. doi:10.1016/j.mycres.2008.05.002. PMID 18945603.
  5. ^ Source dataset. Species Fungorum Plus: Species Fungorum for CoL+. "Sporodictyon". Catalog of Life: Version 2022-07-12. Retrieved 15 July 2022.
  6. ^ Winter, G. (1877). "Ueber Sporodictyon turicense Winter" (PDF). Hedwigia (in German). 16: 53–59.
  7. ^ "Record Details: Sporodictyon aurantiacum Trevis. [as 'aurantium'], Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  8. ^ "Record Details: Sporodictyon confine (Nyl.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  9. ^ "Record Details: Sporodictyon cupulare (A. Massal.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  10. ^ "Record Details: Sporodictyon dermatodes (A. Massal.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  11. ^ "Record Details: Sporodictyon globiferum (Eschw.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  12. ^ "Record Details: Sporodictyon ochraceoflavum (Nyl.) Trevis. [as 'ochraceo-flavum'], Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  13. ^ "Record Details: Sporodictyon rufum (A. Massal.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  14. ^ "Record Details: Sporodictyon rupifragum (A. Massal.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  15. ^ "Record Details: Sporodictyon sericeum (A. Massal.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  16. ^ "Record Details: Sporodictyon variolosum (Pers.) Trevis., Conspect. Verruc.: 13 (1860)". Index Fungorum. Retrieved 15 July 2022.
  17. ^ "Record Details: Sporodictyon tristiculum (Nyl.) Dalla Torre & Sarnth., Fl. Tirol, Vorarlberg, Leichtenstein, IV Band. Die Flechten von Tirol: 554 (1902)". Index Fungorum. Retrieved 15 July 2022.
  18. ^ Arnold, F. (1871). "Lichenologische Ausflüge in Tirol. VI. Die Wald-rast". Verhandlungen der Zoologisch-Botanischen Gesellschaft Wien (in German). 21: 1103–1148.
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