Thamnidium

THAMNIDIUM Link, 1809 (Ges. Naturk. Freunde Berlin Mag. Neuesten Entdeck. Gesammten 3:31); 1 sp. (Benny, 1992—monograph).
Thamnidium Link ex Gray, 1821 ( A Natural Arrangement of British Plants 1: 560; fide Benny, 1992).
Thamnidium Link ex Wallroth, 1833 [ Flora Crypt. Germ. 4(2):324; fide Benny, 1992].
= Melidium Eshweiler: Fr., 1832 ( Syst. Mycol. 3:330; fide Benny, 1992), nomen conserv., Art. 13.1(d) of the ICBN (Greuter et al., 2000; see Korf, 1982, 1983).
Melidium Eshweiler, 1822 ( De Fruct. Gen. Rhizomorphae Comment., p. 33; fide Benny, 1992).

The deliquescent-walled sporangia of Thamnidium are like those formed by Helicostylum. Persistent-walled sporangia are formed at the apex of dichotomously-branched sporangiophores that arise laterally from the main sporangiophore or its branches. Zygospores have opposed suspensors and a rough, dark zygosporangial wall (Benny, 1992).

Type species: T. elegans

Species of Thamnidium:
T. elegans Link, 1809 (Ges. Naturk. Freunde Berlin Mag. Neuesten Entdeck. Gesammten 3:31).

Hesseltine and Anderson (1956) included four species in Thamnidium and they determined that zygospores of T. elegans would form at 7 to 10 C. Mikawa (1979) found T. elegans in Japan. The type species, T. elegans, is the only species included in Thamnidium (Benny, 1992).

Bibliography
Benny, G.L. 1992. Observations on Thamnidiaceae (Mucorales). V. Thamnidium. Mycologia 84:834-842.

Greuter, W., J. McNeill, F.M. Barrie, H.M. Burdet, V. Demoulin, T.S. Filgueiras, D.H. Nicolson, P.C. Silva, J.E. Skog, P. Trehane, N.J. Turland, and D.H. Hawksworth (Eds.). 2000. International code of botanical nomenclature ( St. Louis code ). Reg. veget. 138:1-474.

Hesseltine, C.W., and P. Anderson. 1956. The genus Thamnidium and a study of the formation of its zygospores. Am. J. Bot. 43:696-703.

Korf, R. P. 1982. Citation of authors’ names and the typification of names of fungal taxa published between 1753 and 1832 under the changes in the Code of Nomenclature enacted in 1981. Mycologia 74:250-255.

Korf, R.P. 1983. Sanctioned epithets, sanctioned names, and cardinal principles in “: Pers.” and “: Fr.” citations. Mycotaxon 16:341-352.

Mikawa, T. 1979. A taxonomic study on Japanese sporangiferous Mucorales (4). J. Japan. Bot. 54:120-128.

Updated Mar 12, 2005