Metatrichia vesparia is the current accepted name for this species.

Metatrichia vesparia (Batsch) Nann.-Bremek. ex G.W. Martin & Alexop., Myxomycetes 143 (1969)

["vesparium"] [Proposed earlier by Nannenga-Bremekamp in Proc. Kon. Ned. Akad. Wetensch., C 69(3):348. 1966, but nom. inval., Shenzhen Code art. 41.5 (Melbourne Code art. 41.5, ICBN art. 33.3), basionym reference omitted]

https://eumycetozoa.com/data/report.php?busca=Metatrichia&por=gensi&numr=662&tipo=Rtax

Also in GBIF:

Metatrichia vesparia (Batsch) Nann.-Bremek. ex G.W.Martin & Alexop., 1969

https://www.gbif.org/species/5426334