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The fen orchid (Liparis loeselii (L.) Rich., 1817), specific to calcareous wetlands, is threatened by its habitat degradation and disappearance. It is thus categorised as endangered in the Rhône-Alpes red list and is nationally protected in France. Although many studies have been conducted about Liparis loeselii var. ovata ecology in the coastal zone, few have focused on the loeselii variety growing in continental marshes. Now this variety's ecology must be better known in order to determine efficient conservation actions, especially when using ecological restoration in marshes.

The aim of this study is to characterise ecological factors that explain the state of loeselii variety populations in the French Rhône-Alpes region. The conservation state of 13 wetlands populations were related to plant and fungal communities as well as local environmental factors (e.g. hydrology, soil, management). These relationships were …