In Lichenomphalia chromacea the fruit body produced by the fungal partner in the lichen is a mushroom that appears on soil. It is yellow throughout, with a smooth, dry cap up to about 2 centimetres across and with a central depression. The stems may be up to about 2 centimetres long and the gills run down the stem a little. In this lichen the fruit body is the dominant feature and the associated algal cells appear as a green mat on the soil surface. That mat need be nothing more than a sparse green wash on the soil.
A number of non-lichenized fungi produce similar types of fruit bodies (see Omphalina s.l.: http://canberranaturemap.org/Community/Species/20395). To be sure that you have Lichenomphalia chromacea check both that the colour is yellow and that there is a green, algal mat on what is otherwise bare soil around the yellow mushrooms.
The other species of Lichenomphalia known from the local region is the brown Lichenomphalia umbellifera (https://admin-canberra.naturemapr.org/Community/Species/Sightings/45284).
Lichenomphalia chromacea is listed in the following regions:
Canberra & Southern Tablelands | Southern Highlands | Albury, Wodonga | South Coast | Hume | Loddon Mallee
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Synonyms
Omphalina chromaceaMaps
Alison Hone Reserve ANBG South Annex Aranda Bushland Banksia Street Wetland Corridor Bicentennial Park Black Mountain Bluetts Block (402, 403, 12, 11) Bookham Cemetery & Reserve Boro Bruce Ridge Bruce Ridge to Gossan Hill Bullen Range Callum Brae Dananbilla Nature Reserve Denman Prospect 2 Estate Deferred Area (Block 12) Dryandra St Woodland Endeavour Reserve (Bombala) Farrer Ridge Federal Golf Course Ginninderry Conservation Corridor Goorooyarroo NR (ACT) Gossan Hill Goulburn Mulwaree Council Gundary TSR Gungaderra Grasslands Hall Horse Paddocks Illilanga & Baroona Isaacs Ridge Isaacs Ridge and Nearby Jedbinbilla Kama Kowen Woodland Lake Burley Griffin West Lower Cotter Catchment Lower Molonglo McQuoids Hill Molonglo River Reserve Mongarlowe River Mount Ainslie Mount Jerrabomberra Mount Jerrabomberra QP Mount Majura Mount Mugga Mugga Mount Painter Mount Taylor Mulanggari Grasslands Mulligans Flat Oakdale Nature Reserve Percival Hill Piney Ridge Pomaderris Nature Reserve Rob Roy Range Rugosa Stony Creek Nature Reserve Sweeney's TSR The Pinnacle Tidbinbilla Nature Reserve Tuggeranong Hill Umbagong District Park Wandiyali-Environa Conservation Area Wanna Wanna Nature Reserve Wanniassa HillPlaces
Collector, NSW Hall, ACT