Fissurina is in the family Graphidaceae.[7] In 2018,[8] Kraichak and colleagues, using a "temporal phylogenetic" approach to identify temporal bands for specific taxonomic ranks, proposed placing Fissurina as the type genus of Fissurinaceae, a family originally proposed by Brendan P. Hodkinson in 2012.[9] This taxonomic proposal was rejected by Robert Lücking in a critical 2019 review of the temporal method for the classification of lichen-forming fungi, using this specific example to highlight several drawbacks of this approach.[10]
Fissurina is characterized by fissurine ascocarps (i.e., having a fissured or slit-like disc), poorly developed and non-carbonized or weakly carbonized exciples, and 1-8 spored asci that make thick-walled, trans-septate or muriform hyaline ascospores often with a halo. Acanthothecis is a similar genus with warty paraphyses and periphysoids but can be differentiated from Fissurina by the cylindrical spore locules without a thick jelly-like spore wall. Graphis differs from Fissurina by its carbonized, well-developed exciple (labia) and ascospores without a halo.[11]
Lücking, Robert; Hodkinson, Brendan P.; Leavitt, Steven D. (2017). "The 2016 classification of lichenized fungi in the Ascomycota and Basidiomycota–Approaching one thousand genera". The Bryologist. 119 (4): 361–416. doi:10.1639/0007-2745-119.4.361. JSTOR44250015.
Redinger, K. (1935). "Die Graphidineen der ersten Regnell'schen Expedition nach Brasilien 1892–1894. III. Graphis, Phaeographis, nebst einem Nachtrage zu Graphina". Arkiv för Botanik (in German). 27 (A(3)): 1–103.
Kraichak, Ekaphan; Huang, Jen-Pan; Nelsen, Matthew; Leavitt, Steven D.; Lumbsch, H. Thorsten (2018). "A revised classification of orders and families in the two major subclasses of Lecanoromycetes (Ascomycota) based on a temporal approach". Botanical Journal of the Linnean Society. 188 (3): 233–249. doi:10.1093/botlinnean/boy060.
Lücking, Robert (2019). "Stop the abuse of time! Strict temporal banding is not the future of rank-based classifications in Fungi (including lichens) and other organisms". Critical Reviews in Plant Sciences. 38 (3): 199–253. Bibcode:2019CRvPS..38..199L. doi:10.1080/07352689.2019.1650517.
Sharma, B.O.; Khadilkar, P.; Makhija, U. (2012). "New species and new combinations in the lichen genera Fissurina and Hemithecium from India". The Lichenologist. 44 (3): 339–362. doi:10.1017/S0024282911000752.
Staiger, B. (2002). "Die Flechtenfamilie Graphidaceae: Studien in Richtung einer natürlichen Gliederung". Bibliotheca Lichenologica (in German). 85: 1–526.
Seavey, F.; Seavey, J.; Gagnon, J.; Guccion, J.; Kaminsky, B.; Pearson, J.; Podaril, A.; Randall, B. (2017). "The lichens of Dagny Johnson Key Largo Hammock Botanical State Park, Key Largo, Florida, USA". Bulletin of the Florida Museum of Natural History. 53 (5): 201–268.
Lendemer, J.C.; Harris, R.C. (2014). "Seven new species of Graphidaceae (Lichenized Ascomycetes) from the Coastal Plain of southeastern North America". Phytotaxa. 189: 153–175. doi:10.11646/phytotaxa.189.1.11.
Makhija, U.; Adawadkar, B. (2007). "Trans-septate species of Acanthothecis and Fissurina from India". The Lichenologist. 39 (2): 165–185. doi:10.1017/S0024282907004756.
Weerakoon, Gothamie; Ngo, Kang Min; Lum, Shawn; Lumbsch, H. Thorsten; Lücking, Robert (2015). "On time or fashionably late for lichen discoveries in Singapore? Seven new species and nineteen new records of Graphidaceae from the Bukit Timah Nature Reserve, a highly urbanized tropical environment in South-East Asia". The Lichenologist. 47 (3): 157–166. doi:10.1017/s0024282915000043.
Joshi, S.; Upreti, D.K.; Nguyen, T.T.; Nguyen, A.D.; Oh, S.O.; Hur, J.S. (2015). "A new species of Fissurina and new records of Graphidaceae from Vietnam". Cryptogamie, Mycologie. 36 (4): 383–397. doi:10.7872/crym/v36.iss4.2015.383.
Aptroot, André; de Souza, Maria Fernanda; dos Santos, Lidiane Alves; Junior, Isaias Oliveira; Barbosa, Bruno Micael Cardoso; da Silva, Marcela Eugenia Cáceres (2022). "New species of lichenized fungi from Brazil, with a record report of 492 species in a small area of the Amazon Forest". The Bryologist. 125 (3): 435–467. doi:10.1639/0007-2745-125.3.433.
Poengsungnoen, V.; Manoch, L.; Mongkolsuk, P.; Kalb, K. (2014). "New species of Graphidaceae from Loei Province, Thailand". Phytotaxa. 189 (1): 255–267. doi:10.11646/phytotaxa.189.1.18.
Lücking, Robert; Álvaro-Alba, Wilson Ricardo; Moncada, Bibiana; Marín-Canchala, Norida Lucia; Tunjano, Sonia Sua; Cárdenas-López, Dairon (2023). "Lichens from the Colombian Amazon: 666 taxa including 28 new species and 157 new country records document an extraordinary diversity". The Bryologist. 126 (2): 242–303. doi:10.1639/0007-2745-126.2.242.
Weerakoon, G.; Wijeyaratne, S.C.; Wolseley, P.A.; Rivas Plata, E.; Lücking, R.; Lumbsch, H.T. (2012). "Six new species of Graphidaceae from Sri Lanka". The Bryologist. 115: 74–83. doi:10.1639/0007-2745-115.1.74.
Papong, K.B.; Lücking, R.; Kraichak, E.; Parnmen, S.; Von Konrat, M.; Lumbsch, H.T. (2014). "Twenty-three new species in the lichen family Graphidaceae from New Caledonia (Ostropales, Ascomycota)". Phytotaxa. 189 (1): 204–231. doi:10.11646/phytotaxa.189.1.15.
Komposch, H. (2016). "Fissurina subcorallina (lichenized Ascomycota: Ostropales), another drop in the bucket". Herzogia. 29 (2/1): 473–478. doi:10.13158/heia.29.2.2016.473.
Weerakoon, G.; Jayalal, U; Wijesundara, S.; Karunaratne, V.; Lücking, R. (2015). "Six new Graphidaceae (lichenized Ascomycota: Ostropales) from Horton Plains National Park, Sri Lanka". Nova Hedwigia. 101 (1–2): 77–88. doi:10.1127/nova_hedwigia/2015/0241.
Archer, A.W.; Elix, J.A. (2018). "Fissurina virensica, a new species in the Australian Graphidaceae (Lichenised Ascomycota, Ostropales) containing virensic acid". Australasian Lichenology. 82: 137–139.