Walther Otto Müller, also Otto Müller, (20 June 1833 – 17 July 1887 in Gera) was a German botanist and gardner.
He was mainly interested in Cryptogamae, in particular lichen and mosses.
Müller was the author of some books and several articles in scientific and botanical journals.
He monochrome illustrated at least one.
He collected plants, lichen and mosses for herbaria to sell the exsiccates as loose-leaf-collections.
The topography of Gera region provided flora and fauna from lowland and highland at one rich spot.
Some of his specimens are housed at the British Museum.
Some confuse him with:
Walther Müller, German lithographer in Gera, who somewhen changed the spelling to Walter Müller, complete name Wilhelm Walter Müller (1845-1927), working from 1870 to 1919 as an illustrator, lithographer who produced botanical and anatomical drawing, lithography, chromolithography and hand-colouring, marking with italics WM or WMüller (VIAF-ID: 236205928).
Otto Müller, German botanist in Berlin, complete name Georg Ferdinand Otto Müller (1837-1917), who collected and studied algae (Diatomaceae, Bacillariaceae) from 1870 up to 1912.
He has the taxonomic author abbreviation O.Müll.
(VIAF ID: 295723048).
Otto Müller, German botanist in Breslau (nowadays Wroclaw), who did research in the field of plant physiology of vine 1887.