Isopterygium albescens A. Jaeger
Creators
- 1. Saint Léon, 66000 Perpignan (France) thouvenot. louis @ orange. fr
- 2. Technische Universität Dresden, Institut für Botanik, 01062 Dresden (Germany)
Description
Isopterygium albescens (Hook.) A.Jaeger
Bericht über die Thätigkeit der St. Gallischen Naturwissenschaftlichen
Gesellschaft 1876-77: 433 (Gen. Sp. Musc. 2: 1251) (1878).
Isopterygium sarasinii Thér. Nova Caledonia, Forschungen in NeuCaledonien und auf den Loyalty-Inseln, B. Botanik 1: 31 (1914). — Type: Loyalty Islands, Lifou, 1912, Sarasin & Roux 768, 769, (holo-, PC[PC0094059!]) syn. nov.
COMMENTSThériot (1914) described the new species Isopterygium sarasinii as intermediate between I. neocaledonicum Thér. and I. austropusillum (Müll.Hal.) A.Jaeger, that both became synonyms of I. albescens, together with I. minutirameum (Müll.Hal.) A.Jaeger, also recorded for the country (Iwatsuki & Ramsay 2009).Indeed, our observation of the type of I. sarasinii at PC, with the vegetative and perichaetial leaf shapes, the sporophyte characters and the sizes of all parts being included in the variability of I. albescens, lead us to reduce it in synonymy with the latter species.
The specimen kept in PC is handwritten by Thériot, annotated “sp. nov.” and “fig.”, meaning a drawing by the author (unpublished). It was sent by the Zurich Botanical Museum in order to determine the mosses collected in New Caledonia by K.F. Sarasin during a Swiss mission with J. Roux in 1911-1912. In the publication of the results, Thériot (1914) designated this specimen as the type but not the herbarium localisation. The specimen in PC (PC0094059) is most likely the only plant used by Theriot for its description of the new species and, therefore, the holotype.
Finally, in New Caledonia there is only one species of the genus Isopterygium. The two more reported Isopterygium, I. arquifolium (Bosch et Sande Lac.) Jaeger and I. textorii var. latifolium Cardot & Thériot, now belong to a different genus (see below: Pseudotaxiphyllum pohliaecarpum).
Notes
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References
- THERIOT I. 1914. - Musci de la Nouvelle-Caledonie et des iles Loyalty et diagnoses d'especes nouvelles, in SARASIN F. & ROUX J., Nova Caledonia, Forschungen in Neu-Caledonien und auf den Loyalty-Inseln, B. Botanik 1 C. W. Kreidels, Wisebaden: 23 - 32.
- IWATSUKI Z. & RAMSAY H. P. 2009. - The genera Isopterygium Mitt. (Bryopsida, Hypnaceae) and Isopterygiopsis (Hedw.) Z. Iwats. (Bryopsida, Plagiotheciaceae) in Australia. Telopea 12: 371 - 384. https: // doi. org / 10.7751 / telopea 20095825