Fungalpedia– Note 5 Siepmannia


Siepmannia Kwasna & Nirenberg


Citation if using this entry: Noorabadi MT & Hyde KD. (2023) New genera in 2008. Mycosphere (in press) 

Index Fungorum Identifier 34050, Facesoffungi, MycoBankGenBank, Fig 1

Siepmannia was introduced by Kwaśna & Nirenberg (2008), within Mucoraceae, Mucorales, Mucoromycetes. The type species is Siepmannia pineti Kwaśna & Nirenberg and was isolated from soil of Betula pendula in Poland and is this saprobic. This genus has four species including two new species and two new combinations, based on morphology and phylogenic analysis of the ITS, rDNA sequences. Siepmannia  pineti and Siepmannia lariceti were reported as new species that were isolated from forest soils in Poland (Kwaśna & Nirenberg 2008)



Fig 1. Siepmannia pineti (redrawn from Kwaśna & Nirenberg 2008) a Two young sporangia on a branched sporangiophore. B Sporangiophore branched monopodially. c Sporangium with sporangiospores. d Sporangiospores. e Sporangium on sporangiophore with stolon. Scale bars: a=10μm, b, c, e =20 μm, d =5 μm

The phylogenic clustering with Absidia parricida Renner & Muskat and Absidia zychae Hesselt. & Ellis lead to synonymizing Siepmannia parricida Kwaśna & Nirenberg, and Siepmannia zychae Kwaśna & Nirenberg under the genus Lentamyces by Hoffmann & Voigt (2009) with placement in Lentamycetaceae. Siepmannia is characterized by a slow-growing colonies, loosy cottony that is funiculose or gelatinous, later powdery. The mycelium is white to ochraceous aerial comprising filamentous, thin-walled and branched hyphae. The round cells of sporangiophores are podially or sympodially branched. Sporangiospores are minute, unicellular, hyaline, smooth, spherical, oval or cylindrical. Stolon and rhizoids are present. Zygospores, if present, in aerial mycelium are brown and warty. The size of pendants is equal. Appendices are usually prominent (Hoffmann & Voigt 2009).

Type species: Siepmannia lariceti Kwaśna & Nirenberg

Other accepted species

Siepmannia pineti Kwaśna & Nirenberg



Hoffmann K, Voigt K. 2009 – Absidia parricida plays a dominant role in biotrophic fusion parasitism among mucoralean fungi (Zygomycetes): Lentamyces, a new genus for A. parricida and A. zychae. Plant Biology 11,537–554.

Kwasna H, Nirenberg HI. (2008) – Siepmannia, a new genus in the Mucoraceae. Mycologia 100(2), 259–274.


Entry by

Maryam Tavakol Noorabadi, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand.


(Edited by Kevin D. Hyde)