Editing Lichen (section)

===Diversity===
The largest number of lichenized fungi occur in the [[Ascomycota]], with about 40% of species forming such an association.<ref name="Kirk pp.378-81"/> Some of these lichenized fungi occur in orders with nonlichenized fungi that live as [[saprotroph]]s or [[parasite|plant parasites]] (for example, the [[Leotiales]], [[Dothideales]], and [[Pezizales]]). Other lichen fungi occur in only five [[order (biology)|orders]] in which all members are engaged in this habit (Orders [[Graphidales]], [[Gyalectales]], [[Peltigerales]], [[Pertusariales]], and [[Teloschistales]]).  Overall, about 98% of lichens have an ascomycetous mycobiont.<ref name="Lutzoni Pagel Reeb pp. 937–940">{{cite journal | last1=Lutzoni | first1=François | last2=Pagel | first2=Mark | last3=Reeb | first3=Valérie | title=Major fungal lineages are derived from lichen symbiotic ancestors | journal=Nature | volume=411 | issue=6840 | date=2001 | doi=10.1038/35082053 | pmid=11418855 | pages=937–940| bibcode=2001Natur.411..937L | s2cid=4414913 | url=https://www.semanticscholar.org/paper/f36413b98c70b197806bfb75444e49bf0777b1c8 }}</ref> Next to the Ascomycota, the largest number of lichenized fungi occur in the unassigned [[fungi imperfecti]], a catch-all category for fungi whose sexual form of reproduction has never been observed.{{citation needed|date=October 2014}} Comparatively few [[basidiomycetes]] are lichenized, but these include [[agarics]], such as species of ''[[Lichenomphalia]]'', [[clavarioid fungi]], such as species of ''[[Multiclavula]]'', and [[corticioid fungi]], such as species of ''[[Dictyonema]]''.