Hapalopilus eupatorii (P. Karst.) Spirin & Miettinen comb. nov. Figures 5band 6e

Physisporus eupatorii P. Karst., Revue Mycol. 6: 214 (1884).

Ceriporiopsis herbicola Fortey & Ryvarden.

Remarks.

Hapalopilus eupatorii has completely resupinate, thin basidiocarps on dead herbaceous stems ( Arctium, Eupatorium, and Reynoutria). It has been recorded once on thin fallen branches of Robinia in a thicket of Reynoutria . Karsten (1884) described the species from France as Physisporus eupatorii, but it long remained an enigma for mycologists (Lowe 1956, Donk 1974). Recently it was reported from England as Ceriporiopsis herbicola (Fortey and Ryvarden 2007) and Germany as Hapalopilus nidulans f. resupinata ( Dämmrich 2014).