C. insignibulbus:

Denmark: Sjaelland: Allindelille Fredskov, Fagus on calcareous soil, 26 Sept. 2003, T.S.J., TSJ2003-060 . ̅ France: Ain: Cerin, 15 Oct. 2000, in frondose forest on calcareous soil, un- der Carpinus and Betula, A. Bidaud, 5212 (PC0022484 - holotype) .