Rhytisma umbonatum
(Hoppe ex Wallr.) Rabenh.
IMI 97497. Place of collection: USA; Wyoming; Albany County; Laramie mountains, Wheatland cutoff, state highway 34 (N42°00' W104°57', alt. 1900 m). Date of collection: 1 October 1955. Associated organism: Salix exigua (leaf). Collector: Solheim, W.G.. Literature: page(s) Solheim, Mycoflora Saximontanensis Exsiccata 619.