Rhytisma umbonatum
(Hoppe ex Wallr.) Rabenh.
IMI 23193. Place of collection: USA; North Dakota; Kulm (N46°19' W98°56'). Date of collection: July 1908. Associated organism: Salix longifolia (leaf). Collector: Brenckle, J.F.. Literature: page(s) Fungi Dakotenses 48.