Fungi of the order Chytridiales, like other members of its

division Division or divider may refer to: Mathematics *Division (mathematics), the inverse of multiplication *Division algorithm, a method for computing the result of mathematical division Military *Division (military), a formation typically consisting ...

, may either have a monocentric

thallus Thallus (plural: thalli), from Latinized Greek (), meaning "a green shoot" or "twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. Many of these organisms wer ...

or a polycentric rhizomycelium. When the

ribosomal genes Ribosomal DNA (rDNA) is a DNA sequence that codes for ribosomal RNA. These sequences regulate transcription initiation and amplification, and contain both transcribed and non-transcribed spacer segments. In the human genome there are 5 chromos ...

of members classified in this order were first examined using

molecular A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion. In quantum physics, organic chemistry, and bioche ...

techniques, it was discovered that the order contained some species that were not related. With the culture and characterization of '' Chytridium olla'', the

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen ...

of this order, the limits of the Chytridiales were established. The Chytridiales is now

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

and species such as '' Polychytrium aggregatum'', '' Chytriomyces angularis'' and '' Cladochytrium replicatum'' have been transferred to other orders.

Genera ''incertae sedis''

* '' Achlyella'' * '' Achlyogeton'' * '' Coralliochytrium'' * '' Delfinachytrium'' * '' Pseudorhizidium'' * '' Dermomycoides'' * '' Dictyomorpha'' * '' Ichthyochytrium'' * ''

Mucophilus ''Mucophilus'' is a fungal genus in the Chytridiales of uncertain familial placement. A monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one tha ...

'' * '' Myiophagus'' * '' Plasmophagus'' * '' Rhizidiocystis'' * '' Rhizosiphon'' * '' Sagittospora'' * '' Septolpidium'' * '' Sorokinocystis'' - ''Sorokinocystis mirabilis'' * '' Trematophlyctis''

References

Chytridiomycota Fungus orders Aquatic fungi {{Chytridiomycota-stub