Hemitrichia chrysospora (Lister) Lister (1894: 180). ≡ Hemiarcyria chrysospora Lister (1887: 126). Isolectotype:— UNITED KINGDOM. England: Dorset, Lyme Regis, 50.725ºN 2.940ºW, in larch plantation, 1 Nov 1886, H. Munro, B.M. 1491, [BM001089119 = box] (BM!). Additional material examined:— UNITED KINGDOM. England: Beaminster, Dorset, on leaves, 2 Feb. 1898, leg. G. Lister, B.M. 3013, (BM!). This species is characterized by its sessile, yellowish sporocarps and by its large reticulated spores of 14.7‒18.5µm in diam., ornamented with large-meshed reticulum (6–9 meshes to a hemisphere) and rather broad muri. These characteristics coincide with those studied in both samples by Rammeloo (1984). The sample B.M. 3013 is not indicated by Lado & Wrigley de Basanta (2018). We had only a small portion available for SEM and the microscopic characters of capillitium and spore ornamentation observed are similar to those in the isolectotypus. Hemitrichia mellea Nann. -Bremek. & Loer., is a possibly closely related species that has spores with similar ornamentation, however they are smaller (11–)12–13(–14) µm in diam. (Nannenga-Bremekamp & Loerakker 1981) and the ornamentation of the capillitium has tighter spirals bands with scattered spines (Rammeloo 1984).

Published as part of Moreno, G., Castillo, A. & Thüs, H., 2022, Critical revision of Trichiales (Myxomycetes) at the Natural History Museum London (BM), pp. 1-20 in Phytotaxa 567 (1) on page 15, DOI: 10.11646/phytotaxa.567.1.1, http://zenodo.org/record/7137881