Fungalpedia – Note 3173, Spiralum
Spiralum J.L. Mulder, Transactions of the British Mycological Society 65 (3): 518 (1975).
Citation when using this data: Jian Ma et al. 2024 – Fungalpedia.
Index Fungorum, Faceoffungi, MycoBank, GenBank, Fig 1.
Classification: Incertae sedis, Incertae sedis, Incertae sedis, Incertae sedis, Pezizomycotina, Ascomycota, Fungi.
Notes: Spiralum was established by Mulder (1975), with S. helicosporum as the type species. Spiralum is characterized by solitary, dematiaceous, unbranched, septate, thin-wall, spirally twisted conidiophores that occur mostly in groups, with the apical region appearing swollen and verrucose, and hyaline or occasionally olivaceous, long, smooth, thin-walled, cylindrical, curved or helicoid conidia (Mulder 1975). Spiralum comprises two species: S. erectum and S. helicosporum, which were found in Piper and Ficus copiosa in Asia, respectively (Mulder 1975). The morphology of Spiralum differs from other helicosporous taxa due to its long, cylindrical, helicoid conidia (Mulder 1975; Zhao et al. 2007).
Type species: Spiralum helicosporum J.L. Mulder, Transactions of the British Mycological Society 65 (3): 518 (1975).
Other accepted species: Species Fungorum – search Spiralum.
Figure 1 – (a) Ophiodendron laocooni (redrawn from Arnaud (1952)); (b) Rogergoosiella roystoneicola (redrawn from Seifert et al. (2011)); (c) Slimacomyces monosporus (redrawn from Seifert et al. (2011)); (d) Spiralum helicosporum (redrawn from Seifert et al. (2011)).
References
Mulder JL. 1975 – Spiralum, a new genus from Asia. Transactions of the British Mycological Society 65(3):517–521.
Zhao G, Liu X, Wu W. 2007 – Helicosporous hyphomycetes from China. Fungal Diversity 26:313–524.
Entry by
Jian Ma, School of Food and Pharmaceutical Engineering, Guizhou Institute of Technology, Guiyang 550003, P.R. China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand.
Published online 18 September 2026