''Leiorreuma'' is a genus of

script lichen A script lichen, or graphid lichen, is a member of a group of lichens which have spore producing structures that look like writing on the lichen body. The structures are elongated and narrow apothecia called lirellae, which look like short scribbles ...

s in the family Graphidaceae. It has 18 species. The genus was

circumscribed In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. Not every po ...

by Franz Gerhard Eschweiler in 1824, with '' Leiorreuma hepaticum'' assigned as the type species.

Description

''Leiorreuma'' is identified by certain features. It has apothecia with noticeable opened . The is often thin on the sides but well-developed at the base and appears . The

hymenium The hymenium is the tissue layer on the hymenophore of a fungal fruiting body where the cells develop into basidia or asci, which produce spores. In some species all of the cells of the hymenium develop into basidia or asci, while in others some ...

is dotted with small specks, and the spores are pale brown and have thin walls with crosswise septa or are divided into many compartments (). They are not

stained A stain is a discoloration that can be clearly distinguished from the surface, material, or medium it is found upon. They are caused by the chemical or physical interaction of two dissimilar materials. Accidental staining may make materials app ...

iodine Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...

Species

* '' Leiorreuma convariatum'' * '' Leiorreuma crassimarginatum'' – China * '' Leiorreuma dilatatum'' * '' Leiorreuma ellipticum'' * '' Leiorreuma erodens'' – Florida * '' Leiorreuma exaltatum'' * ''

Leiorreuma explicans ''Leiorreuma'' is a genus of script lichens in the family Graphidaceae. It has 18 species. The genus was circumscription (taxonomy), circumscribed by Franz Gerhard Eschweiler in 1824, with ''Leiorreuma hepaticum'' assigned as the type species. D ...

'' * '' Leiorreuma hepaticum'' * '' Leiorreuma hypomelaenoides'' – Thailand * '' Leiorreuma hypomelaenum'' * '' Leiorreuma melanostalazans'' * '' Leiorreuma nicobarense'' – India * '' Leiorreuma nornotaticum'' * '' Leiorreuma patellulum'' * ''

Leiorreuma sericeum ''Leiorreuma'' is a genus of script lichens in the family Graphidaceae. It has 18 species. The genus was circumscribed by Franz Gerhard Eschweiler in 1824, with '' Leiorreuma hepaticum'' assigned as the type species. Description ''Leiorreuma ...

'' * '' Leiorreuma subpatellulum'' – India * '' Leiorreuma taiwanense'' – Taiwan * '' Leiorreuma vaginans'' * '' Leiorreuma vicarians'' * '' Leiorreuma yakushimense'' – Japan

References

Graphidaceae Lichen genera Graphidales genera Taxa described in 1824 Taxa named by Franz Gerhard Eschweiler {{Lecanoromycetes-stub