''Rhabdodiscus'' is a
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
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 scribbl ...
s in the family
Graphidaceae
The Graphidaceae are a family of lichen-forming fungi in the order Graphidales. The family contains nearly a hundred genera and more than 2000 species. Although the family has a cosmopolitan distribution, most Graphidaceae species occur in tropic ...
. It has 36 species.
Taxonomy
The genus was
circumscribed In geometry, a circumscribed circle for a set of points is a circle passing through each of them. Such a circle is said to ''circumscribe'' the points or a polygon formed from them; such a polygon is said to be ''inscribed'' in the circle.
* Circum ...
by Finnish lichenologist
Edvard August Vainio
Edvard August Vainio (born Edvard Lang; 5 August 185314 May 1929) was a Finnish lichenology, lichenologist. His early works on the lichens of Lapland (Finland), Lapland, his three-volume monograph on the lichen genus ''Cladonia'', and, in part ...
in 1921.
The species of this genus were previously classified in genus ''
Stegobolus'', until
molecular phylogenetic
Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...
analysis showed that ''Stegobolus'' and ''Rhabdodiscus'' formed two separate, distantly related
clade
In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...
s. ''Rhabdodiscus'' was formally reinstated in 2012 to contain the formers members of the ''Stegobolus auberianus''
species group
In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each oth ...
.
Description
''Rhabdodiscus'' is characterised by having a distinctly carbonized (blackened)
apothecia
An ascocarp, or ascoma (: ascomata), is the fruiting body ( sporocarp) of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and millions of embedded asci, each of which typically contains four to eight ascospores. As ...
with thin margins that lack a felt-like
pruina Pruinescence , or pruinosity, is a "frosted" or dusty-looking coating on top of a surface. It may also be called a pruina (plural: ''pruinae''), from the Latin word for hoarfrost. The adjectival form is pruinose .
Entomology
In insects, a "bloom" ...
. In contrast, ''Stegobolus'' species have apothecia that are either uncarbonized to weakly carbonized, and have thick margins with felty pruina on the inner side.
Species
,
Species Fungorum
''Index Fungorum'' is an international project to index all formal names (Binomial nomenclature, scientific names) in the fungus Kingdom (biology), kingdom. As of 2015, the project is based at the Royal Botanic Gardens, Kew, one of three partn ...
accepts 36 species of ''Rhabdodiscus''.
*''
Rhabdodiscus albodenticulatus''
*''
Rhabdodiscus argentinensis''
*''
Rhabdodiscus asiaticus''
*''
Rhabdodiscus bakoensis''
*''
Rhabdodiscus caracasanus''
*''
Rhabdodiscus crassoides''
*''
Rhabdodiscus crassus''
*''
Rhabdodiscus emersellus''
*''
Rhabdodiscus emersus''
*''
Rhabdodiscus exutus''
*''
Rhabdodiscus farinosus''
*''
Rhabdodiscus feigei''
*''
Rhabdodiscus granulosus''
*''
Rhabdodiscus inalbescens''
*''
Rhabdodiscus indicus''
*''
Rhabdodiscus inspersus''
*''
Rhabdodiscus integer''
*''
Rhabdodiscus isidiatus''
– Sri Lanka
*''
Rhabdodiscus isidiifer''
*''
Rhabdodiscus kinabalensis''
*''
Rhabdodiscus korupensis''
*''
Rhabdodiscus lankaensis''
*''
Rhabdodiscus marivelensis''
*''
Rhabdodiscus neocaledonicus''
*''
Rhabdodiscus parnmenianus''
*''
Rhabdodiscus planus''
*''
Rhabdodiscus ramificans''
*''
Rhabdodiscus reconditus''
*''
Rhabdodiscus saxicola''
*''
Rhabdodiscus schizostomus
''Rhabdodiscus'' is a genus of script lichens in the family Graphidaceae. It has 36 species.
Taxonomy
The genus was circumscription (taxonomy), circumscribed by Finnish lichenologist Edvard August Vainio in 1921. The species of this genus were p ...
''
*''
Rhabdodiscus subcavatus''
*''
Rhabdodiscus subemersus''
*''
Rhabdodiscus tanzanicus''
*''
Rhabdodiscus thouvenotii''
*''
Rhabdodiscus trinitatis''
*''
Rhabdodiscus verrucoisidiatus''
References
Graphidaceae
Lichen genera
Taxa described in 1921
Taxa named by Edvard August Vainio
Graphidales genera
{{Lecanoromycetes-stub