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Diromma
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Arthoniomycetes
Order:	Arthoniales
Family:	Roccellaceae
Genus:	Diromma Ertz & Tehler (2014)
Species:	D. dirinellum
Binomial name
*Diromma dirinellum* (Nyl.) Ertz & Tehler (2014)
Synonyms^[1]^[2]
Platygrapha dirinella Nyl. (1856) Lecania diplotommoides Bagl. (1862) Schismatomma dirinellum (Nyl.) Zahlbr. (1923)

Diromma is a monotypic fungal genus in the family Roccellaceae. It contains the single species Diromma dirinellum, a rare crustose lichen that grows as a parasite on the lichen Dirina ceratoniae. It has a distribution restricted to the Mediterranean Basin.^[3]

Taxonomy

This species was first described in 1882 by Finnish lichenologist William Nylander as Platygrapha dirinella, from specimens collected in Sardinia, Italy.^[4] It was transferred to Schismatomma in 1923 by Alexander Zahlbruckner,^[5] and considered a member of that genus for nearly a century. The genus Diromma was circumscribed in 2014 by Anders Tehler and Damien Ernst, following molecular phylogenetic analysis and revision of the Roccellaceae. This analysis showed that the species was a quite distinct lineage in the Roccellaceae. The genus name alludes to both its phylogenetic closeness to Dirina, and its morphological similarity with Schismatomma.^[2]

Description

Diromma dirinellum has a crustose thallus with a cortex. Its ascomata, which are immersed (or partly so) in the thallus, measure 0.2–0.6 mm in diameter, and have a more or less circular to irregular outline. Ascospores are hyaline with 3 septa, and measure 20–30.5 by 4.5–5.5 μm; they are not enclosed in a gelatinous sheath. The photobiont partner is trentepholioid – green algae from genus Trentepohlia. The lichen contains roccellic acid, but does not react with any of the standard chemical spot tests (K−, C−, P−).^[2]

References

^ "Synonymy. Current Name: Diromma dirinellum (Nyl.) Ertz & Tehler, in Ertz, Tehler, Irestedt, Frisch, Thor & van den Boom, Fungal Diversity 70: 41 (2014) [2015]". Species Fungorum. Retrieved 12 November 2022.
^ ^a ^b ^c Ertz, Damien; Tehler, Anders; Irestedt, Martin; Frisch, Andreas; Thor, Göran; van den Boom, Pieter (2014). "A large-scale phylogenetic revision of Roccellaceae (Arthoniales) reveals eight new genera". Fungal Diversity. 70 (1): 31–53. doi:10.1007/s13225-014-0286-5. S2CID 7994392.
^ Nimis, Pier Luigi (2016). The Lichens of Italy. A Second Annotated Catalogue. Trieste: Edizioni Università di Trieste. p. 181. ISBN 978-88-8303-755-9.
^ Nylander, W. (1856). "Synopsis du genre Arthonia". Mémoires de la Société Impériale des Sciences Naturelles de Cherbourg (in Latin). 4: 85–104.
^ Zahlbruckner, A. (1923). Catalogus Lichenum Universalis. Vol. 2. Jena: Bernhard Vopelius. p. 555.

Taxon identifiers
Diromma	Wikidata: Q47498356 Wikispecies: Diromma CoL: 46L5 GBIF: 9722828 IndexFungorum: 808105 MycoBank: 808105 NCBI: 1545988 Open Tree of Life: 5696875 SpeciesFungorum: 808105
Diromma dirinellum	Wikidata: Q47499840 Wikispecies: Diromma dirinellum CoL: 6CZ2C GBIF: 8812338 IndexFungorum: 808106 MycoBank: 808106 NCBI: 1545989 SpeciesFungorum: 808106

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