Stemonitis marjana Y. Yamam., Karstenia

Bo, Zhang & Yu, Li, 2016, A new species, Stemonitis sichuanensis, and a newly recorded species, Stemonitis marjana (Myxogastria) from China, Phytotaxa 258 (2), pp. 195-199 : 197

Stemonitis marjana Y. Yamam., Karstenia 40:197 (2001) figure 2

Description:—Sporocarps clustered, 2–3.5 mm total height, black-brown. Sporotheca cylindrical. Stalk black, polished, 1–1.5 mm long, sometimes fibrous at the base. Hypothallus membranous, pale brown. Peridium fugaceous, sometimes leaving a collar at the base of the sporotheca. Columella black, reaching nearly to the apex. Capillitium arising from the length of the columella, thick, branched, and anastomosed to form an inner net, and forming an irregular surface net, with free ends pointing outwards. Spore black in mass, and brownish-grey by transmitted light, spinulose-reticulate, 7–9 μm in diam. Plasmodium unknown.

Specimen examined: CHINA, Jilin Province, campus of Jilin Agricultural University, on the bark surface of a decaying log, 25 August 2013, Zhang Bo2015051310 (HMJAU10431).

Comments : Stemonitis marjana has been recorded in Japan ( Yamamoto 2000) and France (Michel et al. 2011). The Jilin specimen has slightly smaller spores than the type specimen (8.8–9.8 μm in diam.) ; however, its spores are similar to those of the specimen from France (about 6.5–8 μm in diam.). The type specimen, Jilin specimen, and French specimen all have a similar habitat (decaying logs), rust to rust-tawny spinulose-reticulate spores

Figures

FIGURE 2. Stemonitis marjana: A, B. Sporocarps.C. Part of capillitium and columella. E. Part of capillitium and columella by transmitted light. D, F. Spores marked with spinulose-forming reticulation.