Atla (lichen)

Atla is a genus of crustose lichens in the family Verrucariaceae.[1] It has nine species that grow on rocks or on soil.

Atla
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Eurotiomycetes
Order: Verrucariales
Family: Verrucariaceae
Genus: Atla
Savić & Tibell (2008)
Type species
Atla alpina
Savić & Tibell (2008)

Taxonomy

The genus was circumscribed in 2008 by Sanja Savić and Leif Tibell, with Atla alpina assigned as the type species. According to the authors, the generic name Atla refers to "the name of a Norse water goddess who sometimes accompanied us in the same habitats as the species named after her." Three species were included in the original circumscription of the genus; these species formed a well-defined clade in the family Verrucariaceae, sister to a clade containing several Sporodictyon species.[2] Several newly described species were later added from Alaska and Finland.[3][4]

Description

Atla lichens have crustose thalli that are blackish in colour with a surface texture ranging from warty (verrucose) to diffusely areolate to immersed in the substrate. The perithecia are 0.3–0.9 mm in diameter, and either sessile or immersed. Ascospores are ellipsoid, hyaline to dark brown when mature, and measure 43–87 by 19–49 μm; the spores are muriform (divided into compartments), with 7–15 transverse and 2–5 longitudinal walls. The excipulum (the ring-shaped layer surrounding the hymenium) is spherical, ranging in colour from black to dark brown. The involucrellum (the upper, often exposed covering or cap external to the excipulum) is well developed; depending on the species, the upper part of this structure is either fused together with the excipulum, or missing altogether.[2]

Species

References
  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. S2CID 249054641.
  2. Savić, Sanja; Tibell, Leif (2008). "Atla, a new genus in the Verrucariaceae ( Verrucariales)". The Lichenologist. 40 (4): 269–282. doi:10.1017/s0024282908007512. S2CID 85405431.
  3. Tibell, Sanja; Tibell, Leif (2015). "Two new species of Atla (Verrucariaceae)". The Lichenologist. 47 (2): 93–98. doi:10.1017/s0024282915000018. S2CID 83611538.
  4. Pykälä, Juha; Myllys, Leena (2016). "Three new species of Atla from calcareous rocks (Verrucariaceae, lichenized Ascomycota)". The Lichenologist. 48 (2): 111–120. doi:10.1017/s0024282915000523. S2CID 89862994.
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