Small agaric, growing on litter or wood, with a white spore print. Pileus pale, brown or grey, viscid or not, surface dotted (hand lens). Lamellae adnate, subdecurrent or decurrent. Stipe central, very glutinous, especially at the base. Partial veil remnants absent. Spores hyaline, amyloid, smooth; germ pore absent. Cheilocystidia present. Lamellar trama regular. Pileipellis a hymeniderm of clavate to sphaeropedunculate elements. Clamp connections present.

Some extra-Australian species of Roridomyces have luminous mycelia, spores or fruit-bodies; luminosity of Australian species has not been checked.

The combination of glutinous stipe and dotted pileus surface is diagnostic for Roridomyces, which further differs from Mycena in the hymeniderm pileipellis. Grey or brown species of Arrhenia that occur on wood do not have a glutinous stipe, a hymeniform pileipellis or amyloid spores. Some Hygrocybe have decurrent lamellae and glutinous stipe, but they do not occur on wood or litter, are usually brightly coloured, and do not have amyloid spores.

Roridomyces Rexer, Die Gattung Mycena s.l., Studien zu Ihrer Anatomie, Morphologie und Systematik 132 (1994).

Two species: Roridomyces austrororidus (= Mycena, and previously misidentified in some Australian literature as Mycena rorida) and Mycena yirukensis (which has yet to be transferred into Roridomyces).

W.A., Qld, N.S.W., Vic. and Tas. (and possibly also N.T.).

In native forests (often in Nothofagus cool-temperate rainforest), occasionally in conifer plantations.

On litter or wood.

Saprotrophic.

Fuhrer, B. (2005), A Field Guide to Australian Fungi. Bloomings Books, Hawthorn. [Description and Illustration of R. austrororidus (as Mycena)]

Grey, P. & Grey, E. (2005), Fungi Down Under. Fungimap, South Yarra. [Description, Illustration and Map for R. austrororidus (as Mycena)]

Grgurinovic, C.A. (2003), The genus Mycena in south-eastern Australia. Fungal Diversity Press, Hong Kong and Australian Biological Resources Study, Canberra. [Description, Illustration, B&W Illustration and Microcharacters of R. austrororidus (as Mycena) and Mycena yirukensis]

Horak, E. (1978a), Mycena rorida (Fr.) Quel. and related species from the Southern Hemisphere, Ber. Schweiz. Bot. Ges. 88: 20–29. [Description, B&W Illustration and Microcharacters of R. austrororidus (as Mycena) from Chile and New Zealand]

McCann, I.R. (2003), Australian Fungi Illustrated. Macdown Productions, Vermont. [Illustration of R. austrororidus (as Mycena)]

Young, A.M. (2005b), A Field Guide to the Fungi of Australia. University of New South Wales Press, Sydney. [Description and Illustration of R. austrororidus (as Mycena]