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Nomenclatural pitfalls in the protologue of Hypnum lycopodioides Brid. (Musci)

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The nomenclatural history of Hypnum lycopodioides Brid., a widespread European peatland moss that is currently known as Drepanocladus lycopodioides (Brid.) Warnst. or Pseudocalliergon lycopodioides (Brid.) Hedenäs, is presented. The placement of two neglected and poorly known names, "Hypnum rugosum Sm." and H. diastrophyllum Lam. & DC., in the protologue of H. lycopodioides created some nomenclatural pitfalls. It is shown that H. rugosum sensu Dickson (1801), Withering (1801), Smith (1804) and Smith & Sowerby (1811) are all isonyms of H. rugosum Hedw. [= Rhytidium rugosum (Hedw.) Kindb.] and they have no nomenclatural status. Hypnum diastrophyllum, a species described in 1805, is considered not to be definitely included in the concept of H. lycopodioides, but the latter name is strongly endangered by H. diastrophyllum, if both species are conspecific. Of several specimens cited in the protologue of H. diastrophyllum only one specimen originating from Sweden is available for typification, and it is here selected as lectotype. It makes H. diastrophyllum conspecific with Palustriella commutata (Hedw.) Ochyra, and this taxonomic conclusion saves the current usage of H. lycopodioides. The oldest synonyms and type specimens of H. lycopodioides are listed.
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Keywords: AMBLYSTEGIACEAE; BRYOPHYTA; H DIASTROPHYLLUM; H RUGOSUM; HYPNALES; HYPNUM LYCOPODIOIDES; ISONYMS; NOMENCLATURE; PALUSTRIELLA COMMUTATA; TAXONOMY; TYPIFICATION

Document Type: Research Article

Affiliations: 1: Laboratory of Bryology, Institute of Botany, Polish Academy of Sciences, ul. Lubicz 46, 31-512 Kraków, Poland. 2: Nationaal Herbarium Nederland, Utrecht University branch, Heidelberglaan 2, NL-3584 CS Utrecht, Netherlands.

Publication date: 2003-02-01

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