Superregnum: Eukaryota
Regnum: Fungi
Subregnum: Dikarya
Divisio: Ascomycota
Subdivisio: Pezizomycotina
Classis: Dothideomycetes
Ordo: Trypetheliales
Familia: Trypetheliaceae
Genus: Polymeridium
Species: P. albidoreagens – P. albidovarians – P. albidum – P. albocinereum – P. alboflavescens – P. amyloideum – P. amylosporum – P. bambusicola – P. biloculare – P. campylothelioides – P. catapastoides – P. catapastum – P. chioneum – P. cinereonigricans – P. contendens – P. costaricense – P. dithecium – P. endocrocinum – P. endoflavens – P. flavothecium – P. glaucoatrum – P. inspersum – P. longiflavens – P. multiforme – P. multiseptatum – P. neblinae – P. neuwirthii – P. pleiomeroides – P. pleurothecium – P. proponens – P. pyrenastroides – P. quinqueseptatum – P. simulans – P. subcinereum – P. submuriforme – P. sulphurescens – P. tribulationis – P. xanthoreagens – ...
Name
Polymeridium (Müll. Arg.) R.C. Harris, 1980
Type Species: Polymeridium contendens (Nyl.) R.C. Harris, 1980
Basionym
Arthopyrenia sect. Polymeridium Müll. Arg., 1883
Synonymy
Exiliseptum
References
Primary references
R.C. Harris, in Tucker & Harris, Bryologist 83(1): 12 (1980)
Tucker, S.C. and Harris, R.C. (1980) New or noteworthy pyrenocarpous lichens from Louisiana and Florida. - The Bryologist 83: 1–20. **[RLL List # 106-93 / Rec.# 19055] - (Recent Literature on Lichens)** (JSTOR)
References
Aptroot, A.; da Silva Cáceres, M.E. 2014: A refined species concept in the tropical lichen genus Polymeridium (Trypetheliaceae) doubles the number of known species, with a worldwide key to the species. Nova hedwigia, 98(1-2): 1–29. DOI: 10.1127/0029-5035/2013/0143 Reference page.
Harris, R. 1984: (1986): The family Trypetheliaceae (Loculoascomycetes: lichenized Melanommatales) in Amazonian Brazil. - Supplement Acta Amazonica 14(1/2): 55–80. **[RLL List # 128-46 / Rec.# 7820] - (Recent Literature on Lichens)**
Harris, R.C. (1991) A revision of Polymeridium (Muell. Arg.) R.C. Harris (Trypetheliaceae). - Boletim do Museu Paraense "Emilio Goeldi", série Botânica 7(2): 619–644. **[RLL List # 156 / Rec.# 7812] - (Recent Literature on Lichens)**
Links
Checklist of the Lichens of Australia and its Island Territories
Discussion of Polymeridium by André Aptroot
USDA Plants Database
Polymeridium in Index Fungorum.
Polymeridium in MycoBank.
Vernacular names
English: Polymeridium lichens
Polymeridium is a genus of lichen-forming fungi in the family Trypetheliaceae.[1] Species in the genus are corticolous (bark-dwelling) and typically occur in tropical areas.
Taxonomy
The genus was originally circumscribed as a section of the genus Arthopyrenia by Swiss lichenologist Johannes Müller Argoviensis in 1883. Richard Harris elevated it to generic status in 1980.[2] In his 1993 revision of the genus, Harris identified 19 species. Utilizing a broad species concept, he acknowledged the presence of variations in chemistry and hamathecial inspersion within individual species.[3] André Aptroot and Marcela Cáceres again revised the genus in 2014, using the absence or presence of lichexanthone and the absence or presence of hamathecial inspersion as distinguishing characters for species. The monotypic genus Exiliseptum was incorporated into Polymeridium, as it only differs in one characteristic from several Polymeridium species and does not possess any unique features. As a result of this work, the number of species in the genus increased from 27 to 53.[4]
Description
Polymeridium is characterized by a white to yellowish or grey thallus, which is usually ecorticate (i.e., it lacks a cortex). Its ascomata, the fruiting bodies of the lichen, are simple or fused, appearing as black, spherical to pyriform structures that emerge from the substratum. The ostiole, or opening of the ascomata, can be apical to lateral, brown to black, or exhibit a red anthraquinone colour.[4]
The hamathecium, which refers to the filamentous tissue within the ascomata, is colourless and may contain hyaline or red oil droplets that turn green when treated with potassium hydroxide (KOH) solution. Ascospores are the reproductive spores of the lichen and typically occur in groups of 4 to 8 per ascus. They are colourless, ellipsoid to fusiform in shape, with rounded to subacute ends, and symmetrically 3 to 13-septate to muriform. The ascospores are not constricted at the septa and are sometimes surrounded by a thin to 2–5 μm-thick gelatinous sheath. The septa within the ascospores are not thickened, and the lumina are rectangular and slightly rounded, but not diamond-shaped.[4]
Conidiomata, or structures that produce conidia (asexual spores), are rather rare in the genus Polymeridium. In terms of secondary chemistry, the thallus occasionally contains lichexanthone, while anthraquinones are rarely present in the ostiole or hamathecium.[4]
Species
Polymeridium albidoreagens Aptroot, A.A.Menezes & M.Cáceres (2013)[4]
Polymeridium albidovarians Aptroot (2013)[4]
Polymeridium albidum (Müll.Arg.) R.C.Harris (1986)
Polymeridium albocinereum (Kremp.) R.C.Harris (1993)
Polymeridium alboflavescens Aptroot (2013)[4]
Polymeridium albopruinosum (Makhija & Patw.) Aptroot (2013)[4]
Polymeridium bambusicola Aptroot & L.I.Ferraro (2000)[5] – Argentina
Polymeridium bengoanum (Vain.) Aptroot (2013)[4]
Polymeridium brachysporum (Malme) Aptroot (2013)[4]
Polymeridium catapastoides Aptroot (2013)[4]
Polymeridium catapastum (Nyl.) R.C.Harris (1986)
Polymeridium contendens (Nyl.) R.C.Harris (1980)
Polymeridium corticatum A.A.Menezes, M.Cáceres & Aptroot (2013)[6] – Brazil
Polymeridium costaricense Aptroot (2013)[4]
Polymeridium endoflavens Aptroot, D.S.Andrade & M.Cáceres (2016)[7] – Brazil
Polymeridium fernandoi Aptroot & Weerakoon (2018)[8] – Sri Lanka
Polymeridium inspersum Aptroot (2013)[4]
Polymeridium jordanii (C.W.Dodge) Aptroot (2013)[4]
Polymeridium julelloides E.L.Lima, M.Cáceres & Aptroot (2013)[6] – Brazil
Polymeridium longiflavens Aptroot, C.Mendonça & M.Cáceres (2016)[7] – Brazil
Polymeridium microsporum (Makhija & Patw.) Aptroot (2013)[4]
Polymeridium multiforme Aptroot (2013)[4]
Polymeridium multiseptatum Aptroot, A.A.Menezes & M.Cáceres (2013)[4]
Polymeridium neuwirthii Aptroot (2013)[4]
Polymeridium ocellatum (Müll.Arg.) Aptroot (2013)[4]
Polymeridium pyrenastroides R.C.Harris ex Aptroot (2013)[4]
Polymeridium pyrenuloides (Fée) Aptroot (2013)[4]
Polymeridium quinqueseptatum (Nyl.) R.C.Harris (1980)
Polymeridium refertum (Stirt.) Aptroot (2013)[4]
Polymeridium rhodopruinosum Aptroot (2016)[9] – Puerto Rico
Polymeridium siamense (Vain.) Aptroot (2013)[4]
Polymeridium stramineoatrum (Vain.) Aptroot (2013)[4]
Polymeridium submuriforme Aptroot (2013)[4]
Polymeridium subvirescens (Leight.) Aptroot (2013)[4]
Polymeridium suffusum (C.Knight) Aptroot (2013)[4]
Polymeridium sulphurescens (Müll.Arg.) R.C.Harris (1998)
Polymeridium tribulationis Aptroot (2013)[4]
Polymeridium xanthoexcentricum Flakus & Aptroot (2016)[10] – Bolivia
Polymeridium xanthopleurothecium Aptroot & Etayo (2017)[11] – Panama
Polymeridium xanthoreagens Aptroot (2013)[4]
References
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.
Tucker, Shirley C.; Harris, Richard C. (1980). "New and noteworthy pyrenocarpous lichens from Louisiana and Florida". The Bryologist. 83 (1): 1–20. doi:10.2307/3242389. JSTOR 3242389.
Harris, R.C. (1993). "A revision of Polymeridium (Muell. Arg.) R.C.Harris (Trypetheliaceae)". O Boletim do Museu Paraense Emílio Goeldi, Série Botânica. 7: 619–644.
Aptroot, A.; Cáceres, M.E.S. (2014). "A refined species concept in the tropical microlichen genus Polymeridium (Trypetheliaceae) doubles the number of known species, with a world key to species". Nova Hedwigia. 98: 1–29.
Aptroot, A.; Ferraro, L.I. (2000). "A new species of Polymeridium (Trypetheliaceae), non-lichenized Ascomycetes from the Macrosistema Iberá, Corrientes, Argentina". Bonplandia. 10 (1–4): 139–141.
Aptroot, André; Menezes, Aline Anjos; de Lima, Edvaneide Leandro; Xavier-Leite, Amanda Barreto; Cáceres, Marcela Eugenia da Silva (2013). "New species of Polymeridium from Brazil expand the range of known morphological variation within the genus". The Lichenologist. 45 (4): 545–552. doi:10.1017/s0024282913000200.
Aptroot, André; Mendonça, Cléverton de Oliveira; Andrade, Danyelly Santos; Silva, Jeanne dos Reis; Martins, Suzana Maria de Azevedo; Gumboski, Emerson; Fraga, Carlos Augusto Vidigal; Cáceres, Marcela Eugenia da Silva (2016). "New Trypetheliaceae from northern and southern Atlantic rainforests in Brazil". The Lichenologist. 48 (6): 713–725. doi:10.1017/s0024282916000037.
Aptroot, A.; Weerakoon, G. (2018). "Three new species and ten new records of Trypetheliaceae (Ascomycota) from Sri Lanka". Cryptogamie, Mycologie. 39 (3): 373–377. doi:10.7872/crym/v39.iss3.2018.373.
Aptroot, André; Ertz, Damien; Etayo Salazar, Javier Angel; Gueidan, Cécile; Mercado Diaz, Joel Alejandro; Schumm, Felix; Weerakoon, Gothamie (2016). "Forty-six new species of Trypetheliaceae from the tropics". The Lichenologist. 48 (6): 609–638. doi:10.1017/s002428291600013x.
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.
Etayo, Javier; Aptroot, André (2017). "New and interesting lichens from Panama". The Bryologist. 120 (4): 501–510. doi:10.1639/0007-2745-120.4.501.
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