A monotypic genus with a yellowish-ivory colored omphalinoid agaric

Agaric

An agaric is a type of fungal fruiting body characterized by the presence of a pileus that is clearly differentiated from the stipe , with lamellae on the underside of the pileus. "Agaric" can also refer to a basidiomycete species characterized by an agaric-type fruiting body...

 in the Hymenochaetales

Hymenochaetales

The Hymenochaetales are an order of fungi in the class Agaricomycetes. The order in its current sense is based on molecular research and not on any unifying morphological characteristics. According to one 2008 estimate, the Hymenochaetales contain around 600 species worldwide, mostly corticioid...

 that grows on living Sphagnum

Sphagnum

Sphagnum is a genus of between 151 and 350 species of mosses commonly called peat moss, due to its prevalence in peat bogs and mires. A distinction is made between sphagnum moss, the live moss growing on top of a peat bog on one hand, and sphagnum peat moss or sphagnum peat on the other, the...

Phylogenetically related agarics are in the genera Rickenella

Rickenella

Rickenella is a genus of brightly colored bryophilous agarics in the Hymenochaetales that have an omphalinoid morphology. They inhabit mosses on mossy soils, peats, tree trunks and logs in temperate regions of both the Northern and Southern Hemispheres...

, Blasiphalia

Blasiphalia

Blasiphalia is a monotypic genus with a honey colored omphalinoid agaric in the Hymenochaetales that grows with the liverwort genus Blasia Phylogenetically related agarics are in the genera Rickenella, Gyroflexus, Loreleia, Cantharellopsis and Contumyces, as well as the stipitate-stereoid genera...

, Loreleia

Loreleia

Loreleia is a genus of brightly colored agarics in the Hymenochaetales that have an omphalinoid morphology. They inhabit mosses and or liverworts on soil in temperate regions of the Northern Hemisphere...

, Cantharellopsis

Cantharellopsis

Cantharellopsis is a tan- to whitish-colored bryophilous monotypic genus in the Agaricales. The fruit bodies of the single species Cantharellus prescottii has a form intermediate between an Omphalina and a chanterelle because of its forked, fold-like gills. It inhabits moss on calcareous soils in...

and Contumyces

Contumyces

Contumyces is a genus of brightly colored bryophilous agarics in the Hymenochaetales that have an omphalinoid morphology, and therefore were previously classified in Omphalina. They inhabit mossy silty or sandy soils in the Northern Hemisphere...

, as well as the stipitate-stereoid genera Muscinupta

Muscinupta

Muscinupta is a fungal genus that produces small white delicate fan-shaped to cupulate fruitbodies on mosses. It is monotypic, containing the single species Muscinupta laevis...

and Cotylidia

Cotylidia

Cotylidia is a fungal genus characterized by small to moderately sized, white to palely- yet brightly-colored, stalked, fan-shaped to funnel-shaped fruitbodies with a smooth to wrinkled hymenium, tissues composed of monomitic hyphae, basidia producing smooth, nonamyloid spores, the absence of...

and clavaroid genus, Alloclavaria

Alloclavaria

Alloclavaria is a clavarioid genus in the Hymenochaetales recently segregated from Clavaria by molecular analysis. Phylogenetically related fungi are in the agaricoid genera Rickenella, Contumyces, Gyroflexus, Loreleia, Cantharellopsis and Blasiphalia, as well as the stipitate stereoid genera...

. Gyroflexus brevibasidiatus, the type, amongst the vaguely omphalinoid genera is distinguished by its small, mammiform pileus

Pileus (mycology)

The pileus is the technical name for the cap, or cap-like part, of a basidiocarp or ascocarp that supports a spore-bearing surface, the hymenium. The hymenium may consist of lamellae, tubes, or teeth, on the underside of the pileus...

, growth on Sphagnum

Sphagnum

Sphagnum is a genus of between 151 and 350 species of mosses commonly called peat moss, due to its prevalence in peat bogs and mires. A distinction is made between sphagnum moss, the live moss growing on top of a peat bog on one hand, and sphagnum peat moss or sphagnum peat on the other, the...

, and lack of cystidia.

Etymology

The etymology of the name Gyroflexus is not known. When coined in a prepublication advertisement, it clearly was intended to be applied to several species, although only one, the type was included. Possibly it refers to the slightly undulating stipe in contrast to the very straight stipes of related genera like Rickenella

Rickenella

Rickenella is a genus of brightly colored bryophilous agarics in the Hymenochaetales that have an omphalinoid morphology. They inhabit mosses on mossy soils, peats, tree trunks and logs in temperate regions of both the Northern and Southern Hemispheres...

for which the same author coined that name years earlier. The name Sphagnomphalia is synonymous.