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Pachycudonia spathulata
Sonoma County, California, 2023
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Leotiomycetes
Order:	Rhytismatales
Family:	Cudoniaceae
Genus:	Pachycudonia
Species:	P. spathulata
Binomial name
Pachycudonia spathulata (S.Imai) S.Imai (1950)
Synonyms
Cudonia spathulata S.Imai (1942) Spathularia spathulata (S.Imai) Mains (1956)

Pachycudonia spathulata, commonly known as Manzanita butter clumps, is a rare and little-known fungus that grows in association with manzanita and Pacific madrone trees on the west coast of North America. This fungus was first described in 1942 by Sanshi Imai as Cudonia spathulata and renamed by Imai in 1950 to Pachycudonia spathulata.

Mycologists are investigating the range of this fungus and seeking new observations and specimen collections.

Notes

1. Pachycudonia was proposed as a section of the genus Cudonia in 1936.

References

1. "GSD Species Synonymy. Current Name: Pachycudonia spathulata (S. Imai) S. Imai, Bot. Mag., Tokyo 63: 235 (1950)". Species Fungorum. Retrieved 8 February 2024.
2. "Cudonia spathulata (Manzanita Butter Clumps)". iNaturalist. Retrieved 2024-02-16.
3. Siegel, Noah; Vellinga, Else C.; Schwarz, Christian; Castellano, Michael A.; Ikeda, Diane (2019). A Field Guide to the Rare Fungi of California's National Forests (PDF). Minneapolis, Minnesota: Bookmobile. pp. 267–268. OCLC 1349507560.
4. "Pachycudonia spathulata (302170)". Mycobank.
5. "Pachycudonia spathulata (S.Imai) S.Imai". www.gbif.org. Retrieved 2024-02-16.
6. Science Reports of the Yokohama National University: Biological and geological sciences (in Japanese). Faculty of Education, Yokohama National University. 1953.
7. Roo Vandegrift, Bitty A. Roy & Joanne Schwartz (October 2020). "Manzanita Butter Clumps" (PDF). Fungal Diversity Survey (FUNDIS.org). Sebastopol, California.

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• Helotiales
• Fungi of North America
• Fungi described in 1942
• Taxa named by Sanshi Imai
• Fungus species
• Leotiomycetes stubs