Small agaric, growing on litter or wood, with a white spore print. Pileus white, pale, grey or rarely yellowish, not viscid. Lamellae often rather distant and with interconnections. Stipe lateral, absent or apical (pseudostipe). Partial veil remnants none. Spores hyaline, non-amyloid, smooth; germ pore absent. Cheilocystidia present or absent. Lamellar trama regular. Pileipellis a cutis or a trichoderm. Clamp connections present.

Fruit-bodies of Tetrapyrgos olivaceonigra are very similar in appearance to Campanella, but the spores are distinctly nodulose. Marasmiellus affixus grows on an algal mat and has a very disagreeable odour. If the spores are subglobose, compare with Resupinatus, which shares the gelatinous pileus trama and the pileipellis with highly branched hyphae, but it differs in the dark grey or dark purplish grey pileus and the grey lamellae. The stipe in Gymnopus is usually central or excentric, rather than lateral or absent, and species in that genus also do not combine intervenose lamellae and a gelatinised pileus trama.

Campanella Henn., Bot. Jahrb. Syst. 22: 95 (1895).

Four species: Campanella gigantospora, C. gregaria (lamellae highly interveined and hymenium can appear tubular-poroid), C. junghuhnii and C. tristis, as well as several others undescribed.

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

In native forests.

On litter or wood.

Saprotrophic.

Bougher, N.L. (2007), The genus Campanella in Western Australia, Mycotaxon 99: 327–335. Description, Microcharacters and B&W Illustration of C. gregaria]

Bougher, N.L. (2009a), Fungi of the Perth region and beyond: a self-managed field book, Western Australian Naturalists' Club (Inc.), Perth. [Description and Illustration of C. gregaria]

Fuhrer, B. (2005), A Field Guide to Australian Fungi. Bloomings Books, Hawthorn. [Description and Illustration of C. gigantospora and C. junghuhnii]

McMullan-Fisher, S. & Leonard, P. (2011), A new Campanella for Australia — Campanella tristis, Fungimap Newslett. 42: 6–7. [Illustration, Description and Microcharacters of C. tristis]

Parmasto, E. (1981), On the Asian species of the genus Campanella (Tricholomataceae: Collybieae), Nova Hedwigia 34: 437–447. [Description and Microcharacters of C. junghuhnii]

Segedin, B.P. (1993), Studies in the Agaricales of New Zealand: some new and revised species of Campanella (Tricholomataceae: Collybieae), New Zealand J. Bot. 31: 375–384. [B&W Illustration, Description and Microcharacters of C. tristis and three other species from New Zealand]

Singer, R. (1945), The Laschia-complex (Basidiomycetes), Lloydia 8: 170–230. [Description of C. junghuhnii]

Singer, R. (1975), The neotropical species of Campanella and Aphyllotus with notes on some species of Marasmiellus, Nova Hedwiga 26: 847–895. [Description and Microcharacters of C. gigantospora]