Rhopalogaster is a genus of secotioid basidiomycetes.

The genus is monotypic, and contains the single species Rhopalogaster transversarium, found in the USA.

[2] This fungus was originally described as new to science in 1811 by French botanist Louis Augustin Guillaume Bosc; Elias Magnus Fries transferred it to Cauloglossum in 1829.

The genus was properly defined in 1902 by John Robert Johnston.

[3] This Boletales-related article is a stub.