Siepmannia

SIEPMANNIA Nirenberg & Kwasna 2008 (in Kwasna and Nirenberg, Pol. Bot. J. 53: 187); 2 spp. (Kwasna and Nirenberg, 2008a, 2008b)
= Siepmannia Nirenberg & Kwasna, 2008 (in Kwasna and Nirenberg, Mycologia 100:260), nom. Inval. Arts 37.1, 43.1, 33.4 of the ICBN (McNeill et al., 2006).

Colonies slow-growing, initially gelatinous, at maturity powdery, composed of white or ochraceous, thin-walled, branched hyphae or hyphae may be swollen and contain round cells. Stolons and rhizoids formed. Sporangiophores branched, curved to circinate, usually with a subsporangial septum. Sporangia globose, multispored, wall mostly deliquescent, usually leaving a prominent collar around the columella. Spores haline, smooth-walled, small. Zygospores with opposed suspensors without appendages, zygosporangial wall warted, brown.

Type species: S. pinetii

Species of Siepmannia:

S. laricetii Nirenberg & Kwasna 2008 (in Kwasna and Nirenberg, Pol. Bot. J. 53: 188).
[S. parricida (Renner & Muskat ex Hesseltine & J.J. Ellis) Nirenberg & Kwasna – see Lentamyces (Mucorales].
S. pinetii Nirenberg & Kwasna, 2008 (in Kwasna and Nirenberg, Pol. Bot. J. 53: 188).
[S. zychae (Hesseltine & J.J. Ellis) Nirenberg & Kwasna – see Lentamyces (Mucorales)].

Siepmannia was described twice, the first time the type species of the genus was not cited and, therefore, all of the taxa were invalid (Arts 37.1, 43.1, 33.4 of the ICBN, McNeill et al., 2006). It is possible that both species of Siepmannia were invalidly described and illustrated earlier; S. larcetii as Circinella minutissima (Faurel and Schotter, 1965) and S. pinetii as Circinella indica (Patil and Kale, 1981). Two species transferred to Siepmannia, S. parricida and S. zychae, are considered the only species of Lentamyces (Hoffmann and Voigt, 2009) in this website.

Siepmannia larcetii and S. pinetii were recognized when the soil was placed on a nutrient-poor culture medium and incubated for 5 days in the dark at 20 C, 7 days at 17 C in continuous, near UV light, and finally 30 days at 20-25 C in normal day and night cycle. Separation of the colonies of these two species of Siepmannia required incubation for 6 months at 4 C. Both S. larcetii and S. pinetii, however, grow and sporulate optimally when another fungus is present in the culture dish (Kwasna and Nirenberg, 2008a).

Bibliography

Faurel, L., and G. Schotter. 1965. Notes mycologiques. VI. – Sur quelques champignons coprophiles d’Afrique Equatoriale. Cahiers de La Mabok√© 3: 123-133.

Hoffmann, K. and K. Voigt. 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 10: 537-554).

Kwasna, H. and H.I. Nirenberg. 2008a. Siepmannia, a new genus in the Mucoraceae. Mycologia 100: 259-274.

Kwasna, H. and H.I. Nirenberg. 2008b. Validation of the genus Siepmannia (Mucoraceae) and its four species. Polish Botanical Journal 53:187-188.

McNeill, J., F.R. Barrie, H.M. Burdet, V. Demoulin, D.L. Hawksworth, K. Marhold, D.H. Nicolson, J. Prado, P.C. Silva, J.E. Skog, J.H. Wiersema and N.J. Turland. [eds.]. 2006. International Code of Botanical Nomenclature (Vienna Code). [Regnum Vegetabile Vol. 126]. A.R.G. Gantner Verlag KG, Ruggell, Liechtenstein. 568 p.

Patil, S. D., and J. C. Kale. 1981. A new species of Circinella van Tiegh. and Le Monn. Current Science 50: 544.

Updated Jun 13, 2010