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MichaelA.Vincent W.S.Turrell Herbarium Department of Biology Miami University Oxford, OH 45056USA

Physarum gyrosum Rostafinsky Physaraceae

Significance ofthe Report.This is the first report of the species for the state of Ohio.

Previous knowledge. Physarum gyrosum is a widespread slime mold that is known from Europe,Asia,Africa, SouthAmerica, Pacific islands (Hawaii, New Zealand), Australia, and NorthAmerica (GBIF 2016; Ing 1999; Liu et al. 2013; Yamamoto 1998 ). In the continental United States, the species is known from at least California, Colorado, Florida, Illinois, Indiana, Iowa, Kansas, Louisiana, Maine, Maryland, Massachusetts, Mississippi, Nebraska, New Hampshire, New York, North Carolina, North Dakota, Pennsylvania, Virginia, and Wyoming (GBIF 2016; Hagelstein 1944; MYCOPORTAL 2016). The species is not listed in any work on slime molds for Ohio (Fullmer 1921; Keller and Braun 1999).

Discussion. The placement of this species has varied from treatment to treatment of slime molds. Physarum gyrosum was first described by Rostafinsky in 1874 (Rostafinsky 1874–1876) from specimens from Europe. Lister (1894) first placed the species in synonymy under Fuligo septica Gmelin, but later (Lister and Lister 1902) confirmed the distinct nature of the species.Among treatments for slime molds in North America, Macbride (1922) placed P. gyrosum in synonymy under P. bethelii (Macbride) Lister in one place, while recognizing it as distinct elsewhere in the same publication. Hagelstein (1944) and Martin and Alexopoulos (1969) recognizedthe species as distinct. Ithas also been treated as a species of Fuligo, F. gyrosa (Rostaf.)E. Jahn (Lado 2001). Most recently, however, the species has been maintained as a species in the genus Physarum (Lado 2001; Neubert et al. 1995; Stephenson 2003).

In Ohio, the several treatments of slime molds for the state (Fullmer 1921; Keller and Braun 1999) do not include P. gyrosum as a part of the myxomycete biota.

Diagnostic Characters. The plasmodiocarps of this species are densely crowded and clumped in ash-grey masses, 2–3 mm high, 2–4 mm wide, with narrow sinuous ridges ca. 0.1–0.2 mm wide, which appear to form rings, nets, rosettes, or snakelike or wormlike patterns. The peridium is membranous and

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single, and covered with whitish or slightly reddish calcareous granular deposits. The capillitium is dense and delicate, with frequent white, sharp transverse crosswall-like nodes, as well as smaller fusiform nodes. The spores are dark brown en masse, and faintly spinulose (Martin and Alexopoulos 1969; Nan- nenga-Bremekamp 1991; Neubert et al. 1995).

SpecimenCitation.Ohio. Butler County: Oxford, Miami University campus, Upham Hall courtyard. Base of dead Magnolia macrophylla Michx., with Co- prinellus disseminatus (Pers.: Fries) J. E. Lange, mosses, and bare soil. 39.508552°N, –84.733215°W, 276m. August 18, 2016. Vincent 17611 (MU).


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Publishing Co., Slough, England. Keller, H.W., and K. L. Braun. (1999). Myxomycetes ofOhio:Their systematics, biology, and use in teaching. Ohio Biological Survey Bulletin New Series 13(2): 1–182.

Lado, C. (2001). Nomenmyx, a nomenclatural database of Myxomycetes. Cauadernos deTrabajo de FloraMicológicaIbérica, 16. Consejo Superior deInvestigacionesCintífica, RealJardínBotanico, Madrid, Spain.

Lister, A. (1894). A monograph of the mycetozoa. British Museum (Natural History), London. Lister, A., and G. Lister. (1902). Notes on Mycetozoa. Journal of Botany, British and Foreign 40: 209–218, Plate 438. Liu, C.-H., J. H. Chang, and F.-Y.Yeh. (2013). Myxomycetes ofTaiwan XXIV.The genus Physarum.

Taiwaniana 58: 176–188. Macbride, T. H. (1922). The NorthAmerican slime-moulds. MacMillan, NewYork, N.Y. Martin, G.W., andC. J.Alexopoulos. (1969).The myxomycetes. University ofIowaPress, Iowa City. MYCOPORTAL. (2016). Mycology Collections data Portal. Available at

portal/index.php (Accessed December 2, 2016). Nannenga-Bremekamp, N. E. (1991).A guide to temperate myxomycetes. (English translation of De Nederlandse Myxomyceten, byA. Feest andY. Burggraaf). Biopress Ltd., Bristol, England.

Neubert, H., W. Nowotny, K. Baumann, and H. Marx. (1995). Die Myxomyceten Deutschlands und des angrenzenden Alpenraumes unter besonderer Beru..cksichtigung O..sterreichs. Band 2 Physar- ales. Karlheinz BaumannVerlag, Gomaringen, Germany.

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cis¬ych w Paryzu 5(4): 1–215 (1875), 6(1): 217–432 (1875), Dodatek [Appendix] 8(4): 1–43 (1876). Stephenson, S. L. (2003). Fungi of New Zealand. Volume 3: Myxomycetes of New Zealand. Fungal Diversity Press, Hong Kong. Yamamoto,Y. (1998). The myxomycete biota of Japan. Toyo Shorin Publishing Co., Tokyo, Japan.