Dictyomeridium

Dictyomeridium
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Dothideomycetes
Order:	Trypetheliales
Family:	Trypetheliaceae
Genus:	Dictyomeridium; Aptroot, M.P.Nelsen & Lücking (2016)
Type species
	Dictyomeridium proponens; (Nyl.) Aptroot, M.P.Nelsen & Lücking (2016)
Species
	D. amylosporum; D. campylothelioides ; D. immersum; D. isohypocrellinum; D. lueckingii; D. paraproponens; D. proponens; D. tasmanicum

Dictyomeridium is a genus of corticolous (bark-dwelling), crustose lichens in the family Trypetheliaceae.[1] It has eight species.

Taxonomy

The genus was circumscribed in 2016 by lichenologists André Aptroot, Matthew Nelson, and Robert Lücking, with Dictyomeridium proponens assigned as the type species. The seven species they included in the genus were mostly previously classified in the genus Polymeridium, while the type species was known by different names in the genus Campylothelium. Phylogenetic analysis showed that the group of species was distant from the core group of their previous genus.[2] An eight species, from Australia, was added to the genus in 2022.[3]

Description

Dictyomeridium is distinguished from other genera in the family Trypetheliaceae by its muriform (multichambered) ascospores, the lateral ostioles of its ascomata, and several subtle microscopic differences in the form of the hamathecium and the ascospores. Dictyomeridium species are distinguished from each other by their reaction to the UV test, the dimensions of their spores, and by the presence or absence of a red pigment in their ostioles. All species lack a cortex, and have conical to pyriform ascomata with eccentric (i.e., not placed centrally) ostioles. Sometimes, pycnidia are present.[2]

Species

Dictyomeridium amylosporum (Vain.) Aptroot, M.P.Nelsen & Lücking (2016) – pantropical
Dictyomeridium campylothelioides (Aptroot & Sipman) Aptroot, M.P.Nelsen & Lücking (2016) – Asia
Dictyomeridium immersum (Aptroot, A.A.Menezes & M.Cáceres) Aptroot, M.P.Nelsen & Lücking (2016) – Brazil
Dictyomeridium isohypocrellinum (Xavier-Leite, M.Cáceres & Aptroot) Aptroot, M.P.Nelsen & Lücking (2016) – Brazil
Dictyomeridium lueckingii Flakus & Aptroot (2016)[4] – Bolivia
Dictyomeridium paraproponens (Aptroot, M.Cáceres & E.L.Lima) Aptroot, M.P.Nelsen & Lücking (2016) – Brazil
Dictyomeridium proponens (Nyl.) Aptroot, M.P.Nelsen & Lücking (2016) – pantropical
Dictyomeridium tasmanicum P.M.McCarthy & Kantvilas (2022)[3] – Tasmania, Australia

References

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.
Lücking, Robert; Nelsen, Matthew P.; Aptroot, André; Barillas de Klee, Roselvira; Bawingan, Paulina A.; Benatti, Michel N.; et al. (2016). "A phylogenetic framework for reassessing generic concepts and species delimitation in the lichenized family Trypetheliaceae (Ascomycota: Dothideomycetes)". The Lichenologist. 48 (6): 739–762. doi:10.1017/s0024282916000505. S2CID 135438593.
McCarthy, P.M.; Kantvilas, G. (2022). "A new species of Dictyomeridium (lichenized Ascomycota, Trypetheliaceae) from Tasmania". Australasian Lichenology. 90: 10–13.
Flakus, Adam; Kukwa, Martin; Aptroot, André (2016). "Trypetheliaceae of Bolivia: an updated checklist with descriptions of twenty-four new species". The Lichenologist. 48 (6): 661–692. doi:10.1017/s0024282915000559. S2CID 89161746.

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[Wijayawardene_et_al._2022-1] 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.

[Lücking_et_al._2016-2] Lücking, Robert; Nelsen, Matthew P.; Aptroot, André; Barillas de Klee, Roselvira; Bawingan, Paulina A.; Benatti, Michel N.; et al. (2016). "A phylogenetic framework for reassessing generic concepts and species delimitation in the lichenized family Trypetheliaceae (Ascomycota: Dothideomycetes)". The Lichenologist. 48 (6): 739–762. doi:10.1017/s0024282916000505. S2CID 135438593.

[McCarthy_&_Kantvilas_2022-3] McCarthy, P.M.; Kantvilas, G. (2022). "A new species of Dictyomeridium (lichenized Ascomycota, Trypetheliaceae) from Tasmania". Australasian Lichenology. 90: 10–13.

[Flakus_et_al._2016-4] Flakus, Adam; Kukwa, Martin; Aptroot, André (2016). "Trypetheliaceae of Bolivia: an updated checklist with descriptions of twenty-four new species". The Lichenologist. 48 (6): 661–692. doi:10.1017/s0024282915000559. S2CID 89161746.