Neolecta

Neolecta is a genus of ascomycetous fungi. The species share the English designation "Earth tongues" along with some better-known fungi (e.g. Geoglossum, Microglossum) with a similar general form, but in fact they are only distantly related.

Neolecta
Neolecta irregularis
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Subdivision:	Taphrinomycotina
Class:	Neolectomycetes O.E. Erikss. & Winka 1997[1]
Order:	Neolectales Landvik, O.E. Erikss, Gargas & P. Gustaffs. 1993[2]
Family:	Neolectaceae Redhead 1977[3]
Genus:	Neolecta Speg. 1881
Species
Neolecta flavovirescens Neolecta irregularis (Irregular Earth Tongue) Neolecta vitellina (=N. aurantiaca) (Egg-yellow Earth Tongue)

Neolecta is the only genus belonging to the family Neolectaceae, which is the only family belonging to the order Neolectales. Neolectales, in turn, is the only order belonging to the class Neolectomycetes, which belongs to the subdivision Taphrinomycotina of the Ascomycota.^[4]

Description

Fruiting bodies take the shape of unbranched to lobed bright yellowish, orangish to pale yellow-green colored, club-shaped, smooth, fleshy columns up to about 7 centimetres (3 inches) tall.^[3][5]

Neolecta fruitbodies consist of hyphae and a hymenium. The hymenium lacks paraphyses and the asci lack croziers, which makes the genus distinctive among other earth-tongues.^[3][5] Neolecta vitellina forms masses of conidia by budding, hinting at the possibility that it also produces a yeast state.^[3]

Similar species

Species of the genus may resemble those of Clavulinopsis and Spathularia.^[6]

Taxonomy

Neolecta does not have any close relatives. Phylogenetically, it clusters weakly with a bizarre group of basal Ascomycota^[4][7] including: Taphrina, a dimorphic, half yeast, half filamentous genus parasitic on leaves, branches, and catkins; Schizosaccharomyces, a genus of fission yeasts (e.g. Schizosaccharomyces pombe); and Pneumocystis, a yeast-like genus of mammalian parasites. To date, the genus has been unculturable, suggesting it is either obligately parasitic or symbiotic. It provides important evidence for the evolutionary history of the Ascomycota and has been called a living fossil.^[8]

The genome of N. irregularis has been sequenced.^[9] Sequence analysis has revealed that rudimentary multicellularity is deeply rooted in the Ascomycota.

Distribution and habitat

Neolecta is found in Asia, Northern Europe, North America, and southern Brazil.^[5] The species all live in association with trees, and at least one, N. vitellina, grows from rootlets of its host,^[10] but it is not known whether the fungus is parasitic, saprotrophic, or mutualistic.^[5] It is said to be edible.^[3]