Career
His contributions include studies on the Agaricales (gilled mushrooms), especially the genus Russula, about which he wrote a monograph in 1933. The work was considered the "authoritative treatment of the group for Central Europe." One of the Russula species that was first described in this publication was R. laeta. Schäffer developed a chemical test to help with the identification of Agaricus species.
A positive reaction of Schaeffer"s test, which uses the reaction of aniline and nitric acid on the surface of the mushroom, is indicated by an orange to red color.
lieutenant is characteristic of species in the section Flavescentes. The compounds responsible for the reaction were named schaefferal A and B to honor Schäffer.
Schäffer is the only mycologist of modern times known to have died from consuming poisonous mushrooms, in this case, Paxillus involutus. His condition worsened to the point where he was admitted to hospital the following day, and subsequently developed renal failure, perishing after 17 days.
Several species have been named in honor of Schaeffer: Agaricus schaefferianus Hlavácek 1987 now Agaricus urinascens (July Schäff & Fachhochschule Møller) Singer 1951) Cortinarius schaefferanus (Military Medal Moser) M.M. Moser 1967 Cortinarius schaefferi Bres.
1930 Dermocybe schaefferi (Bres) M.M. Moser 1986 Lentinus schaefferi (Weinm) Rauschert 1988 now Neolentinus schaefferi (Weinm) Redhead & Ginns 1985 Phyllosticta schaefferiae Gonz. Frag. & Cif. 1926 Russula nauseosa various schaefferi Kill. 1939 Russula schaefferi Kärcher 1996 Russula schaefferiana Niolle 1943 Russula schaefferina Rawla & Sarwal 1983.