Fissurina is a genus of lichenized fungi in the family Graphidaceae. It has about 160 species, most of which are found in tropical regions.

Taxonomy
The genus was circumscribed by the French botanist Antoine Laurent Apollinaire Fée in an 1825 publication. Some later authors preferred to use the name Fissurina to describe infrageneric (i.e., below genus level) groups of the genus Graphis, such as Edvard Vainio in 1921 who used it as a subgenus, and Alexander Zahlbruckner (1923) and Karl Redinger (1935), who used the name for sections.

Fissurina is in the family Graphidaceae. In 2018, 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. 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.

Description
Fissurina is characterized by fissurine ascocarps (i.e., having a fissured or slit-like ), poorly developed and non- or weakly carbonized s, and 1-8 spored asci that make thick-walled, trans-septate or  hyaline  often with a halo. Acanthothecis is a similar genus with warty  and  but can be differentiated from Fissurina by the cylindrical spore  without a thick jelly-like spore wall. Graphis differs from Fissurina by its carbonized, well-developed exciple (labia) and ascospores without a halo.

Species

Fissurina abdita 
Fissurina adscribens 
Fissurina aggregatula  – Florida
Fissurina albocinerea 
Fissurina albolabiata  – Florida
Fissurina albonitens 
Fissurina alligatorensis 
Fissurina amazonica 
Fissurina americana 
Fissurina amyloidea 
Fissurina analphabetica  – Florida
Fissurina andamanensis  – India
Fissurina aperta 
Fissurina astroisidiata 
Fissurina atlantica 
Fissurina aurantiacolirellata 
Fissurina aurantiacostellata 
Fissurina baishanzuensis 
Fissurina batavana 
Fissurina bullata 
Fissurina capsulata  – India
Fissurina carassensis 
Fissurina chapsoides 
Fissurina chrysocarpa 
Fissurina chrysocarpoides 
Fissurina cinereodisca 
Fissurina cingalina 
Fissurina coarctata  – India
Fissurina columbina 
Fissurina comparilis 
Fissurina comparimuralis 
Fissurina confusa  – Florida
Fissurina crystallifera 
Fissurina cypressi 
Fissurina disposita  – India
Fissurina dumastii 
Fissurina dumastioides 
Fissurina duplicans 
Fissurina duplomarginata 
Fissurina elaiocarpa 
Fissurina elixii 
Fissurina evanida 
Fissurina flavicans 
Fissurina flavomedullosa  – Peru
Fissurina fujisanensis 
Fissurina furfuracea 
Fissurina fuscoalba 
Fissurina gigas 
Fissurina glauca 
Fissurina globulifica 
Fissurina hemithecioides  – Vietnam
Fissurina homichlodes 
Fissurina howeana 
Fissurina humilis 
Fissurina ilicicola 
Fissurina illiterata 
Fissurina immersa  – India
Fissurina inabensis 
Fissurina incisura 
Fissurina indica  – India
Fissurina insidiosa 
Fissurina inspersa  – Florida
Fissurina intercludens 
Fissurina isidiata 
Fissurina jaliscoensis 
Fissurina karnatakensis  – India
Fissurina khasiana  – India
Fissurina linoana 
Fissurina longiisidiata 
Fissurina longiramea  – India
Fissurina lumbschiana 
Fissurina macrospora 
Fissurina mexicana  – Florida
Fissurina microcarpa  – India
Fissurina micromma 
Fissurina monilifera 
Fissurina nicobarensis  – India
Fissurina nigrolabiata 
Fissurina niveoalba  – Thailand
Fissurina paradoxica 
Fissurina parvicarpa 
Fissurina phuluangii  – Thailand
Fissurina platythecioides  – Peru
Fissurina praetermissa 
Fissurina pseudostromatica  – Florida
Fissurina psoromica 
Fissurina redingerioides 
Fissurina reticulata 
Fissurina rubiginosa 
Fissurina rufula 
Fissurina scolecitis 
Fissurina seychellensis 
Fissurina shivamoggensis 
Fissurina simplex  – India
Fissurina simulans 
Fissurina sporolata  – India
Fissurina srilankensis  – Sri Lanka
Fissurina stegoboloides 
Fissurina streimannii 
Fissurina stromatoides 
Fissurina subcomparimuralis 
Fissurina subcontexta 
Fissurina subcorallina 
Fissurina subfurfuracea 
Fissurina submonospora  – India
Fissurina subnitidula 
Fissurina subtropica 
Fissurina subundulata  – China
Fissurina tachygrapha 
Fissurina taeniocarpoides 
Fissurina tenuimarginata  – Mexico
Fissurina triticea 
Fissurina tuberculifera  – Sri Lanka
Fissurina tuckermaniana  – Florida
Fissurina undulata 
Fissurina varieseptata  – Florida
Fissurina verrucosa  – India
Fissurina virensica 
Fissurina vorax 
Fissurina zahlbruckneriana

References

Lichen genera
Graphidales genera
Taxa named by Antoine Laurent Apollinaire Fée
Taxa described in 1825