The type material in the David W. Mitchell myxomycete collection at the Royal Botanic Garden, Kew Author Lado, Carlos 0000-0002-6135-2873 Real Jardín Botánico, CSIC, Plaza de Murillo 2, 28014 Madrid (Spain) Author Basanta, Diana Wrigley De 0000-0002-7700-8399 Real Jardín Botánico, CSIC, Plaza de Murillo 2, 28014 Madrid (Spain) text Phytotaxa 2024 2024-05-20 649 2 135 158 http://dx.doi.org/10.11646/phytotaxa.649.2.1 journal article 10.11646/phytotaxa.649.2.1 1179-3163 13215967 * Physarum pusillopse D.W. Mitch. & Nann. -Bremek., Proc. Kon. Ned. Akad. Wetensch., C. 80(4):310 (1977) Isotypus : UNITED KINGDOM . England, S. Wiltshire , Bishopsstone, The Horseshoe, 8SU077248, in bark of dead tree (probably elm), 15 Mar 1975 , leg. D.W. Mitchell, DWM 1868 [one box + one slide, K-M001435018], ( Fig. 6H ). Notes. According to the original publication of the species ( Mitchell & Nannenga-Bremekamp 1977: 310 ), the holotype is in K-M000171168 ( Fig. 6I ) and this isotype in the Mitchell collection. There is another isotype in the Nannenga-Bremekamp collection sub no. 9315, now in BR5020061438371, and probably in the private collection of H.W. Keller.