Astrothelium

Astrothelium is a large genus of corticolous (bark-dwelling) lichens in the family Trypetheliaceae.[2] The genus is characterized by a corticate thallus and diverse ascomata structures, which can be simple, aggregated, or forming pseudostromata. Astrothelium is also notable for the carbonized walls of its ascomata, the so-called textura intricata (i.e., tightly interwoven) arrangement of cells in these walls, and various forms of distoseptate, transparent spores.

Astrothelium
Astrothelium aeneum found in Florida
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Dothideomycetes
Order: Trypetheliales
Family: Trypetheliaceae
Genus: Astrothelium
Eschw. (1824)
Type species
Astrothelium conicum
Eschw. (1824)
Synonyms[1]

Taxonomy

The genus was circumscribed in 1824 by German botanist Franz Gerhard Eschweiler, with Astrothelium conicum assigned as the type species.[3]

Description

The thallus, or the vegetative body of Astrothelium, is corticate, meaning it is covered by a protective cortex. The ascomata, which are the fruiting bodies containing the reproductive spores, can appear in various forms such as simple, aggregated, or forming pseudostromata. These structures often differ in their composition and colour, and can be used as characters to distinguish between species. The ascomata can range from being immersed within the thallus to prominently displayed on the surface. The ostioles, or small openings that allow the release of spores, can be located at the apex or eccentrically on the ascomata and may appear as either simple or fused structures.[4]

Astrothelium is also notable for its ascomatal wall, which is made up of hyphal cells and is typically carbonized. The wall features a textura intricata, a term used to describe a tightly interwoven arrangement of cells.[4]

Within the hamathecium, the tissue that houses the asci (spore-producing structures), the cells are either clear or filled with oil droplets. The ascospores, which are the sexual spores responsible for reproduction, are distoseptate and hyaline in appearance. They can also exhibit a variety of forms, including transversely septate or muriform, reflecting their segmented or multi-cellular nature.[4]

Species

As of March 2023, Species Fungorum accepts 267 species in Astrothelium.[5]

Trypethelium marcidum
  • Astrothelium marcidum (Fée) Aptroot & Lücking (2016)[4]
  • Astrothelium mediocrassum Aptroot (2016)[6]
  • Astrothelium megacrypticum Lücking, M.P.Nelsen & N.Salazar (2016)[10]
  • Astrothelium megaeneum Flakus & Aptroot (2016)[8] – Bolivia
  • Astrothelium megaleium (Kremp.) Aptroot & Lücking (2016)[4]
  • Astrothelium megalophthalmum (Müll.Arg.) Aptroot & Lücking (2016)[4]
  • Astrothelium megalostomum (Vain.) Aptroot & Lücking (2016)[4]
  • Astrothelium megaspermum (Mont.) Aptroot & Lücking (2016)[4]
  • Astrothelium megatropicum Aptroot (2016)[6]
  • Astrothelium megeustomum Aptroot & C.A.V. Fraga (2016)[7] – Brazil
  • Astrothelium megeustomurale M.Cáceres & Aptroot (2017)[9] – Brazil
  • Astrothelium meghalayense (Makhija & Patw.) Pushpi Singh & Kr.P. Singh (2015)
  • Astrothelium megochroleucum Aptroot (2016)[6]
  • Astrothelium meiophorum (Nyl.) Aptroot & Lücking (2016)[4]
  • Astrothelium meristosporoides (P.M.McCarthy & Vongshew.) Aptroot & Lücking (2016)
  • Astrothelium meristosporum (Mont. & Bosch) Aptroot & Lücking (2016)[4]
  • Astrothelium mesoduplex Aptroot & M.Cáceres (2016)[11] – Brazil
  • Astrothelium miniannulare Kalb & Aptroot (2018)[16]
  • Astrothelium minicecidiogenum Aptroot & Sipman (2019)[12] – Costa Rica
  • Astrothelium mordonialense Simijaca, Lücking & Moncada (2021)
  • Astrothelium neglectum Luangsuph., Aptroot & Sangvichien (2016)
  • Astrothelium neodiplocarpum Flakus, Kukwa & Aptroot (2016)[8] – Bolivia
  • Astrothelium neogalbineum (R.C.Harris) Aptroot & Lücking (2016)[4]
  • Astrothelium neoinspersum Aptroot (2016)[6]
  • Astrothelium neovariolosum Luangsuph., Aptroot & Sangvichien (2016)
  • Astrothelium nicaraguense Lücking, M.P.Nelsen & T.Orozco (2016)[10]
Astrothelium nigratum

References
  1. "Synonymy: Astrothelium Eschw., Syst. Lich.: 26 (1824)". Species Fungorum. Retrieved 26 October 2021.
  2. 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.
  3. Eschweiler, Franz Gerhard (1824). Systema Lichenum, Genera Exhibens rite distincta, Pluribus Novis Adaucta (in Latin). Nuremberg: J.L. Schrag. pp. 18, 26.
  4. Aptroot, André; Lücking, Robert (2016). "A revisionary synopsis of the Trypetheliaceae (Ascomycota: Trypetheliales)". The Lichenologist. 48 (6): 763–982. doi:10.1017/s0024282916000487. S2CID 89119724.
  5. "'Astrothelium". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 27 March 2023.
  6. 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. S2CID 89128070.
  7. 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. S2CID 89239545.
  8. 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.
  9. da Silva Cáceres, Marcela Eugenia; Aptroot, André (2017). "Lichens from the Brazilian Amazon, with special reference to the genus Astrothelium". The Bryologist. 120 (2): 166–182. doi:10.1639/0007-2745-120.2.166. S2CID 89775760.
  10. Lücking, Robert; Nelsen, Matthew P.; Aptroot, André; Benatti, Michel Navarro; Binh, Nguyen Quoc; Gueidan, Cecile; Gutiérrez, Martha Cecilia; Jungbluth, Patricia; Lumbsch, H. Thorsten; Marcelli, Marcelo P.; Moncada, Bibiana; Naksuwankul, Khwanruan; Orozco, Thelma; Salazar-Allen, Noris; Upreti, Dalip K. (2016). "A pot-pourri of new species of Trypetheliaceae resulting from molecular phylogenetic studies". The Lichenologist. 48 (6): 639–660. doi:10.1017/S0024282916000475. S2CID 89090696.
  11. Aptroot, André; Cáceres, Marcela Eugenia da Silva (2016). "New Trypetheliaceae from the Amazon basin in Rondônia (Brazil), the centre of diversity of the genus Astrothelium". The Lichenologist. 48 (6): 693–712. doi:10.1017/s0024282915000584. S2CID 89013757.
  12. Aptroot, André; Sipman, Harrie J.M.; Barreto, Flávia Maria Oliveira; Nunes, Ariel Dantas; Cáceres, Marcela Eugenia da Silva (2019). "Ten new species and 34 new country records of Trypetheliaceae". The Lichenologist. 51 (1): 27–43. doi:10.1017/s002428291800052x. S2CID 92498542.
  13. Kukwa, Martin; Rodriguez-Flakus, Pamela; Aptroot, André; Flakus, Adam (2023). "Two new species of Astrothelium from Sud Yungas in Bolivia and the first discovery of vegetative propagules in the family Trypetheliaceae (lichen-forming Dothideomycetes, Ascomycota)". MycoKeys. 95: 83–100. doi:10.3897/mycokeys.95.98986. PMC 10210239. PMID 37251997.
  14. Córdova-Chávez, Octavio; Aptroot, André; Castillo-Camposa, Gonzalo; Cáceres, Marcela Eugenia da Silva; Pérez-Pérez, Rosa Emilia (2014). "Three new lichen species from cloud forest in Veracuz, Mexico". Cryptogamie, Mycologie. 35 (2): 157–162. doi:10.7872/crym.v35.iss2.2014.157. S2CID 86296849.
  15. da Silva Cáceres, Marcela Eugenia; Aptroot, André (2016). "First inventory of lichens from the Brazilian Amazon in Amapá State". The Bryologist. 119 (3): 250–265. doi:10.1639/0007-2745-119.3.250. S2CID 88999038.
  16. Kalb, Klaus; Aptroot, André (2018). "New lichen species from Brazil and Venezuela". The Bryologist. 121 (1): 56–66. doi:10.1639/0007-2745-121.1.056. S2CID 91174453.
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