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Roridomyces roridus
Photo credit: Arne Aronsen

The genome of Roridomyces roridus (Mycena rorida) was sequenced as part of the Mycenaceae sequencing project and the overarching JGI 1000 Fungal Genomes project “Deep Sequencing of Ecologically-relevant Dikarya“ (CSP 1974).This project will examine members of the Mycena genus to evaluate the genomic basis of their different nutritional modes.

The dripping bonnet, Roridomyces roridus

Roridomyces roridus is a member of the Roridae section (Aronsen and Læssøe 2016). It was transfered from Mycena to the new genus Roridomyces by Rexer (1994). It grows among needles and vegetable debris under both coniferous and deciduous trees. Roridomyces roridus has overall whitish/yellowish colours on pileus and stipe, and whitish, decurrent lamellae. Pileus is 0.5–1.5 cm in diameter, usually mostly convex, and it has a stipe of 2-6 cm covered in a thick slime layer . It has been described as bioluminescent (Desjardin et al. 2008), and it is commonly found throughout the northern hemisphere, as well as in Australia. The culture here was isolated by Juliet Frankland 5/6 1981 from a specimen collected in Weeley Wood (UK) which grew on deciduous litter.

Roridomyces roridus is close to the base in the Mycena sensu stricto clade (Thoen et al. 2019, unpublished), and is comparatively divergent genetically to the other Mycena species. We sequenced it in order to elucidate the base of and provide perspective to the core Mycena s.s. clade.

This genome was derived from dikaryotic (diploid) pure culture on MEA agar with ampicilin and benomyl and should be free of xenobiotic contaminations. Researchers who wish to use data from unpublished Mycena genomes for publication are respectfully required to contact the PI and JGI to avoid potential conflicts on data use and coordinate other publications with the Mycena master paper(s).


Aronsen, A.; Læssøe, T.: The genus Mycena s.l. in The Fungi of Northern Europe, vol. 5. Copenhagen, 373 p (2016).

Desjardin DE, Oliveira AG, Stevani CV (2008). "Fungi bioluminescence revisited". Photochemical & Photobiological Sciences. 7 (2): 170–82

Rexer, K.H:: Die Gattung Mycena s.l., Studien zu Ihrer Anatomie, Morphologie und Systematik (Tübingen): 132 (1994)

Thoen, E., Harder, C.B., Kauserud, H., Botnen, S., Vik, U, Taylor, A.F.S., Menkis, A., Skrede, I.: The ubiquitous mycenas - purely saprotrophs or potential plant root symbionts? (unpublished).