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Gomphoid Mushrooms     

[ Basidiomycota > Gomphales > Gomphaceae . . . ]

by Michael Kuo

Gomphoid mushrooms are generally sturdy, fleshy, and vase-shaped, with wrinkled outer surfaces. They are more common in northern and montane forests, and most species are mycorrhizal partners with trees. Preliminary research (Giachini, 2004) has indicated a potential relationship between the appearance of Gomphus fruiting bodies and the volume of woody debris present.

The traditional distinction between gomphoid mushrooms and the chanterelles is that the former have large, coarse scales on the cap surface--or have stems that are fused together, sharing two or more caps. Under the microscope, gomphoid mushrooms have roughened spores, while the spores of Cantharellus and Craterellus species are smooth.

Identification of gomphoid mushrooms is not difficult, and can generally be accomplished without microscopic analysis. In fact, this is one area where DNA studies over the last decade or so have made things easier for would-be identifiers, rather than more difficult; a substantial number of species traditionally separated from Turbinellus floccosus (née Gomphus floccosus) on the basis of minor differences in colors and spore sizes have been reduced to synonymy with Turbinellus floccosus on the basis of molecular results.

If you are wondering what happened to the Gomphus described in your field guides, research by Admir Giachini (2004, 2010, 2011) has made several important findings. First, DNA suggests that the genus Gomphus should be limited to three species centered around Gomphus clavatus (which is the only one of the three occurring in North America). Second, the species traditionally centered around "Gomphus floccosus" should be treated in a separate genus; Giachini proposes an older genus name, Turbinellus. Third, as noted above, many of the floccosus-like "species" are so genetically similar that they probably do not deserve separate species status. Fourth, the floccosus-like and clavatus-like groups are distant enough, genetically, that several species of Ramaria (see Clubs and Corals) are grouped between them, indicating a clear separation. Last (for our purposes here, anyway), some species traditionally treated in Gomphus are even more distantly related, and belong in the little-known genus Gloeocantharellus.

 

Turbinellus floccosus

Gomphus clavatus

Turbinellus floccosus




Key to 3 Gomphoid Mushrooms in North America     


1.Stems almost always sharing multiple caps; purple or lilac shades present (not merely resulting from bruising) on young, fresh specimens.

1.Stems not sharing multiple caps; purple shades absent in all stages of development, except in one species as bruising reactions.
2


2.Known from western North America and the Appalachian Mountains; cap color pale tan to brownish (never dark red or orange); scales on the cap surface brown, abundant, firm, upturned, small near the edge of the cap but large and coarse toward the center.
Turbinellus kauffmanii

2.Known from across montane and boreal North America; cap color ranging from cinnamon or pale orange to bright orange or bright orange-red; scales when present orange to red, less abundant, soft, appressed, smaller than above, and more or less equally sized across the cap surface.



References


Bigelow, H. E. (1978). Cantharelloid fungi of New England and adjacent areas. Mycologia 70: 707-756.

Corner, E. J. H. (1966). A monograph of cantharelloid fungi. Oxford: Oxford UP. 255 pp.

Giachini, A. J. (2004). Systematics, phylogeny, and ecology of Gomphus sensu lato. Doctoral dissertation, Oregon State University. 446 pp. Retrieved 31 July, 2016 from https://ir.library.oregonstate.edu/xmlui/handle/1957/10681

Giachini, A. J., K. Hosaka, E. Nouhra, J. Spatafora & J. M. Trappe (2010). Phylogenetic relationships of the Gomphales based on nuc-25s-rDNA, mit-12s-rDNA, and mit-atp6-DNA combined sequences. Fungal Biology 114: 224-234.

Giachini, A. J. & M. A. Castellano (2011). A new taxonomic classification for species in Gomphus sensu lato. Mycotaxon 115: 183-201.

Pilz, D., L. Norvell, E. Dannell & R. Molina. (2003). Ecology and management of commercially harvested chanterelle mushrooms. Portland, Oregon: USDA General Technical Report. 83 pp. Retrieved 31 July, 2016 from http://www.fs.fed.us/pnw/pubs/gtr576.pdf

Pine, E. M. et al. (1999). Phylogenetic relationships of cantharelloid and clavarioid Homobasidiomycetes based on mitochondrial and nuclear rDNA sequences. Mycologia 91: 944-963.

Smith, A. H. (1968). The Cantharellaceae of Michigan. Michigan Botanist 7: 143-183.

Thiers, H. D. (1985). The Agaricales of California. 2. Cantharellaceae. Eureka, CA: Mad River Press. 34 pp.



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Kuo, M. (2016, August). Gomphoid mushrooms. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/gomphoid.html

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