In vitro studies show that acetosyringone increases mycorrhizae formation in the fungus Glomus intraradices.
Ericoid mycorrhiza are considered crucial for the success of the family Ericaceae in variety of edaphically stressful environments worldwide.
Like other orchids, the creeping lady's tresses live in symbiosis with a mycorrhiza, a rhizome-dwelling fungus (Ceratobasidium cornigerum or Rhizoctonia goodyearae-repentis).
Described as new to science in 2012, it is found in the Cordillera Talamanca of Costa Rica, where it grows in a mycorrhizal association with the oak species Quercus copeyensis and Quercus seemannii.
Although the fungus is suspected to be mycorrhizal (like all Lactarius), there was a wide diversity of plant species growing in the open, dry forest where the mushroom was found (including members of the tree families Euphorbiaceae, Fabaceae, Myrtaceae, Nyctaginaceae, and Polygonaceae—all known to form mycorrhizal associations), so the authors did not speculate on any specific interactions.
Redhead and Watling speculate that the fungus may be mycorrhizal with Hudsonia.