Rhizogonium Brid.

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Bridel, S.E. von (1827), Bryologia Universa 2: 663

Nomenclature

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Gilmore, S.R. in McCarthy, P.M. (ed.) (2006), Rhizogoniaceae. Flora of Australia 51: 364
 APC
 NSL
  Gilmore, S.R. in McCarthy, P.M. (ed.) (2006), Rhizogoniaceae. Flora of Australia 51: 364
 APC
 NSL

Specimens

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Etymology

The name refers to the copious paraphyses suggesting a rooted sporophyte, fide H.A.Crum & L.E.Anderson, Mosses of Eastern North America 2: 657 (1981).

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Description

Dioicous. Plants tufted, yellow to olive-green. Stems short, simple, tomentose at the base. Rhizoids smooth, red-brown. Propagula absent. Leaves complanate, distichous, imbricate, erect-spreading to wide-spreading, often decurrent, ovate to linear-lanceolate; apex acute to acuminate; margin entire to singly toothed, with or without a distinct border; costa strong, ending below apex to excurrent; laminal cells small, isodiametric.

Perichaetia basal, often in tomentum. Calyptra cucullate. Capsules inclined to pendulous (rarely erect), cylindrical, conical or urceolate, widest at the mouth; exothecal cells isodiametric; operculum rostrate, short or long, with the apex bent to one side. Peristome double; endostome 33–50% the length of the exostome. Spores globose to ovoid, smooth.

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Habitat and Distribution

Rhizogonium includes c. 20 species, with many occurring in the wet-tropics. Four species are known from Australia, although three occur mainly in cool-temperate areas.

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Nomenclature And Typification

Rhizogonium Brid., Bryol. Univ. 2: 663 (1827). Type: R. novaehollandiae (Brid.) Brid.

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Excluded Or Uncertain Names

Rhizogonium alpestre Müll.Hal., Hedwigia 36: 333 (1897).

The original and rather vague description by Müller is the only known report of this species. Watts & Whitelegge (J. Linn. Soc. New South Wales 30 (Suppl.): 146, 1906) suggested that it might belong in Porotrichum. The type specimen (formerly in B, and probably destroyed during the Second World War) was collected from Mt Wellington, Tas., but this moss has not been found since.

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Taxonomic Notes

The genus is similar to elements of Pyrrhobryum, with the stem leaves varying from small at the base to larger above.

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Bibliography

Eddy, A. (1996), Rhizogoniaceae, Handb. Malesian Mosses 3: 197–214.

Inoue, S. & Iwatsuki, Z. (1976), A cytotaxonomic study of the genus Rhizogonium Brid. (Musci), J. Hattori. Bot. Lab. 41: 389–403.

Koponen, T., Touw, A. & Norris, D.H. (1986), Bryophyte flora of the Huon Peninsula, Papua New Guinea. XIV. Rhizogoniaceae (Musci), Acta Bot. Fenn. 133: 1–24.

Manuel, M.G. (1981), Synopsis of Rhizogoniaceae Broth. in Malaya, Cryptog. Bryol. Lichénol. 2: 449–455.

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Source

S.R.Gilmore (2012), Australian Mosses Online 36. Rhizogoniaceae. Australian Biological Resources Study, Canberra. Version 7 June 2012.

First published as:  S.R.Gilmore (2006), Rhizogoniaceae, Fl. Australia 51: 354–366. Australian Biological Resources Study, Canberra & CSIRO Publishing, Melbourne.

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© Copyright Commonwealth of Australia, 2023
Last updated: System; Feb 20, 2020 12:49 Status: Complete

Author - Scott R. Gilmore

Editor(s) - Pat M. McCarthy (2012)

Acknowledgements -

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Cite this profile as: Scott R. Gilmore (2020) Rhizogonium. In: Flora of Australia. Australian Biological Resources Study, Department of Climate Change, Energy, the Environment and Water, Canberra. https://profiles.ala.org.au/opus/boa/profile/Rhizogonium [Date Accessed: 04 April 2025]