Ulota viridis var. dixonii (Malta) H.P.Ramsay

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Ramsay, H.P. in McCarthy, P.M. (ed.) (2006), Ulota in Orthotrichaceae. Flora of Australia 51: 236, 411, Fig. 29L-V, Map 119

Nomenclature

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Specimens

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Description

Plants tufted; stems creeping, 20–25 mm long, with erect branches 8–13 mm tall, branching towards apex. Branch leaves appressed, not twisted when dry, lanceolate, 1.5–2.1 mm long, with an oblong base; apices straight, not projecting when dry. Stem leaves 1.5–2.1 mm long; marginal basal cells hyaline, in 1–3 rows. Setae to 5.5 mm long. Capsules subcylindrical, scarcely ribbed when dry. Spores with large papillae.

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Diagnostic Features

This variety is similar to var. viridis in the creeping stems, the slightly twisted dry leaves and the yellow-bordered capsule rim. However, it differs in being larger and more robust, paler above, and with larger, lanceolate stem leaves that taper gradually from oblong bases. The border of hyaline cells also narrower (1–3 rows wide; 4–6 rows in var. viridis). Malta (1933) considered the spores of U. dixonii to be distinctly verrucose compared with the papillose spores of U. viridis, this being the principal difference between the two. These should be regarded as varieties of U. viridis rather than as separate species.

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Biostatus

Native.

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Habitat and Distribution

Endemic to Tasmania.

Epiphytic on the limbs of trees.

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Nomenclature And Typification

Ulota viridis var. dixonii (Malta) H.P.Ramsay, Fl. Australia 51: 411 (2006); Ulota dixonii Malta, Acta Horti Bot. Univ. Latv. 7: 19 (1933). Type: Hartz Mtns, Tas., 7 Jan. 1908, W.A. Weymouth s.n. (annotated “WAW 2299”); holo: H-BR; iso: HO.

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Representative Herbarium Specimens

Tas.: Golden Staircase Track, Lake Dobson, Mount Field National Park, 7 Dec. 1988, B. Polly s.n. (HO).

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Taxonomic Notes

G.O.K.Sainsbury (Bull. Roy. Soc. New Zealand 5: 223, 1955) described U. novae-seelandiae Sainsbury from New Zealand with affinities to “U. dixonii”. The former also has a creeping habit, leaves that are appressed and scarcely twisted when dry, but the hyaline border is broader, the operculum has a red rather than yellow rim, and the spores are smaller. A.J.Fife (pers. comm.; Bryologist 98: 331, 1995) synonymised U. novae-seelandiae with U. viridis.

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Illustrations

N. Malta, Acta Horti Bot. Univ. Latv. 7: 20, fig. 10 (1933), as Ulota dixonii.

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Bibliography

Malta, N. (1933), A survey of Australasian species of Ulota, Acta Horti Bot. Univ. Latv. 7: 1–24.

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Source

H.P. Ramsay, D.H. Vitt & J. Lewinsky-Haapasaari (2012), Australian Mosses Online 47. Orthotrichaceae. Australian Biological Resources Study, Canberra. Version16 June 2012. 

First published as: H.P.Ramsay (2006), Orthotrichaceae: Ulota, Fl. Australia 51: 228–236. Australian Biological Resources Study, Canberra & CSIRO Publishing, Melbourne.

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© Copyright Commonwealth of Australia, 2023
Last updated: Unknown; Feb 29, 2024 12:43 Status: Partial

Author - H.P. Ramsay

Editor(s) - P.M. McCarthy (2006); A.E. Orchard (May 2019)

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Cite this profile as: H.P. Ramsay (2024) Ulota viridis var. dixonii. 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/Ulota%20viridis%20var.%20dixonii [Date Accessed: 12 April 2025]