Heinrich Simon Ludwig Friedrich Felix Rehm (20 October 1828, Ederheim – 1 April 1916, Munich) [1] was a German mycologist and lichenologist.
He studied at the Universities of Erlangen, Munich and Heidelberg, earning his medical doctorate in 1852.
[2] Starting with 1869 until his death Rehm distributed exsiccata specimens in five series, one of them co-edited by Ferdinand Christian Gustav Arnold.
1861 was named after him by lichenologist August von Krempelhuber, it is now a synonym of Rhizocarpon.
1902 now Trichosphaerella, Rehmiellopsis Bubák & Kabát 1910 now Delphinella, Rehmiodothis Theissen & H.Sydow, 1914, Discorehmia Kirschst.