Hemitrichia chrysospora (Lister) Lister (1894: 180)

Moreno, G., Castillo, A. & Thüs, H., 2022, Critical revision of Trichiales (Myxomycetes) at the Natural History Museum London (BM), Phytotaxa 567 (1), pp. 1-20 : 15

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).