The Hydropoid Clade

[ Basidiomycetes > Agaricales > ?-aceae . . . ]

by Michael Kuo

Moncalvo et al. (2002) have compiled nuclear large subunit rDNA evidence for nearly 900 mushrooms; they estimate that their study includes one-tenth of the known species of gilled mushrooms. The "Hydropoid Clade" is one of 117 clades arranged in their enormous phylogram; I have summarized it below, conflating its branches.

Hydropoid Clade

What is especially interesting about this clade of genetically related mushrooms is what is not in the list. Chrysomphalina chrysophylla, for example, which looks an awful lot like Gerronema strombodes, is clustered 39 clades away on the phylogram with the waxy caps in the Hygrophoraceae Group--and major groups like Amanita and Tricholoma stand between them!

My (possibly flawed) reading of the Moncalvo et al. phylogram suggests that the authors are uncertain as to which family holds the hydropoid clade; hence I have placed the clade in the "?-aceae" in the taxonomy bar above. The current Dictionary of the Fungi places Gerronema in the Marasmiaceae, Megacollybia and Clitocybula in the Tricholomataceae, Porotheleum in the Schizophyllaceae, and tentatively places Hydropus in the Tricholomataceae. However, the Dictionary was published before the Moncalvo et al. paper.


Kirk, P.M. et al., eds. (2001). Ainsworth & Bisby's dictionary of the fungi. Oxford: CAB International. 655 pp.

Moncalvo, J. M., et al. (2002). One hundred and seventeen clades of euagarics. Molecular Phylogenetics and Evolution 23: 357400.

Cite this page as:

Kuo, M. (2004, November). The hydropoid clade. Retrieved from the MushroomExpert.Com Web site:

© MushroomExpert.Com