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.

[2][3] This fungus was first described in 1942 by Sanshi Imai as Cudonia spathulata and renamed by Imai in 1950 to Pachycudonia spathulata.

[4][5][a] Mycologists are investigating the range of this fungus and seeking new observations and specimen collections.

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