Rhodoarrhenia [SEP] parent taxon
Rhodoarrhenia
Rhodoarrhenia is a genus of fungi in the family Bolbitiaceae. Most "Rhodoarrhenia" species have a tropical or subtropical distribution. The genus was circumscribed by mycologist Rolf Singer in 1963. He made "R. pezizoidea" the type species; in its taxonomic history, this fungus had been placed in the genera "Merulius", "Campanella", "Rimbachia", and "Arrhenia" by various authors. 
See also.
- List of Agaricales genera
Taxon in disguise
In bacteriology, a taxon in disguise is a species, genus or higher unit of biological classification whose evolutionary history reveals has evolved from another unit of similar or lower rank, making the parent unit paraphyletic. This happens when rapid evolution makes a new species appear radically different from the ancestral group, so that it is not (initially) recognised as belonging to the parent phylogenetic group, leaving the latter an evolutionary grade.
While the term is from bacteriology, parallel examples are found throughout the tree of