Palustriella Pluristratosa Spec. Nov. (Amblystegiaceae, Bryopsida), a New Aquatic Moss Species with Pluristratose Lamina from Switzerland
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Palustriella pluristratosa spec. nov. (Amblystegiaceae, Bryopsida), a new aquatic moss species with pluristratose lamina from Switzerland Autor(en): Stech, Michael / Frahm, Jan-Peter Objekttyp: Article Zeitschrift: Botanica Helvetica Band (Jahr): 111 (2001) Heft 2 PDF erstellt am: 06.10.2021 Persistenter Link: http://doi.org/10.5169/seals-73905 Nutzungsbedingungen Die ETH-Bibliothek ist Anbieterin der digitalisierten Zeitschriften. Sie besitzt keine Urheberrechte an den Inhalten der Zeitschriften. Die Rechte liegen in der Regel bei den Herausgebern. Die auf der Plattform e-periodica veröffentlichten Dokumente stehen für nicht-kommerzielle Zwecke in Lehre und Forschung sowie für die private Nutzung frei zur Verfügung. Einzelne Dateien oder Ausdrucke aus diesem Angebot können zusammen mit diesen Nutzungsbedingungen und den korrekten Herkunftsbezeichnungen weitergegeben werden. 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(Amblystegiaceae, Bryopsida), a new aquatic moss species with pluristratose lamina from Switzerland Michael Stech1 and Jan-Peter Frahm2 institute of Biology, Systematic Botany and Plant Geography, Free University of Berlin, Altensteinstraße 6.D-14195 Berlin, Germany 2Botanical Institute of the University of Bonn, Meckenheimer Allee 170, D-53115 Bonn, Germany Manuscript accepted August 21,2001 Abstract Stech M. and Frahm J.-P. 2001. Palustriella pluristratosa spec. nov. (Amblystegiaceae, Bryopsida), a new aquatic moss species with pluristratose lamina from Switzerland. Bot. Helv. 111:139-150. Palustriella pluristratosa spec. nov. is described from Switzerland as the fourth European species of aquatic pleurocarpous mosses with variously pluristratose laminae. According to a maximum parsimony analysis of a combined data set of cpDNA trnL intron and partial nrDNA ITS2 sequences, this species belongs to the Amblystegiaceae and is closely related to Palustriella commutata. The trnL intron and ITS2 sequences of both species are completely identical. Morphologically, both species are also similar, but P. pluristratosa is distinguished by the 2-3-stratose lamina, a stronger ill-defined costa, slightly narrower laminai cells and the lack of paraphyllia. Key words: Palustriella pluristratosa spec, nov.; trnLjjaa intron; ITS2; Amblystegiaceae. Introduction During the annual fieldtrip of the Central European Bryological and Lichenologi- cal Working Group (BLAM) in the canton Valais (Switzerland), the second author found an unknown aquatic moss in a stream in the subalpine belt at 1800 m altitude on gneiss rocks, which was conspicuously rigid. It much resembled submerse forms of 139 140 Michael Stech and Jan-Peter Frahm Palustriella commutata (Hedw.) Ochyra (Cratoneuron commutation [Hedw.] Roth) growing in fast flowing streams, which had been described as var.falcata (Brid.) Ochyra or on species level as Palustriella falcata (Brid.) Hedenäs. However, a microscopic examination revealed that the leaves had a pluristratose lamina and a very strong, ill defined costa. Since the mid 80's, several aquatic pleurocarpous mosses with variously pluristratose laminae and strong costae have been described in mostly monospecific genera, both from Europe (Ochyraea tatrensis Vâna from the Tatra Mountains, Slovakia, Vâna 1986; Gradsteinia torrenticola from Tenerife, Ochyra et al. 1998; Platyhypnidium muta- tum Ochyra and Vanderpoorten from the Black Forest, Germany, Ochyra and Vander- poorten 1999), and from overseas (Hypnobartlettia fontana Ochyra from New Zealand, Ochyra 1985a; Koponenia holoneuron [Herz.] Ochyra from Bolivia, Ochyra 1985b; Gradsteinia andicola Ochyra from Colombia, Ochyra 1990; Table 1). In their first descriptions, these species were called "remarkable" (Ochyraea, Gradsteinia), "unique" (Hypnobartlettia) or "mysterious" (Platyhypnidium mutation), to express their special combination of characters in contrast to other aquatic mosses, which sometimes also have a strong costa, e.g., Hygroamblystegium noterophilum (Sull.) Warnst, (see Mönke- meyer 1927, Fig. 162c), but unistratose laminae. For the genera with variously pluristratose laminae mentioned above, Ochyra (1985a) established the families Donrichardsiaceae (species with partially pluristratose laminae or pluristratose leaf borders, and foliose pseudoparaphyllia), and Hypnobartlettiaceae (species with completely bistratose laminae, filamentous para- phyllia and foliose pseudoparaphyllia). However, the taxonomic status of both families as well as of the monospecific genera remained doubtful due to the absence of sporophytes and the curious distribution patterns of the species, which are all very rare and mostly only known from their respective type localities (Stech and Frahm 2000). Recent molecular and morphological analyses (Table 2) clearly showed that both families are artificial and have to be rejected, as the species belong to either Amblyste- giaceae or Brachytheciaceae. In the case of Platyhypnidium mutatum, molecular data (in combination with the finding of sporophytes) were also able to clarify the taxonomic status of the species and to determine its nearest relative. While it was originally intended to describe this moss as a new species of Donrichardsia, both DNA sequences and sporophyte morphology supported a close relationship with Platyhypnidium riparioides in the Brachytheciaceae (Stech and Frahm 1999), which grows abundantly at the type locality of P. mutation. It was supposed that P. mutatum was derived from P. riparioides by mutations of genes responsible for the formation of its different gametophytic characters, a broader costa and an irregularly bi- or pluristratose lamina. This study initiated Ochyra and Bednarek-Ochyra (1999) to transfer Gradsteinia torrenticola also into Platyhypnidium. In contrast, the genera Hypnobartlettia, Gradsteinia (for G. andicola) and Ochyraea have to be maintained, because 1) all of these species exhibit different combinations of gametophytic characters and 2) their nearest relatives could not be identified at the molecular level. In this study, the new moss from Switzerland is investigated based on gametophytic characters and molecular data (cpDNA fruLUAA intron and nrDNA ITS2 sequences) and compared with the other species of the former Donrichardsiaceae and Hypnobartlettiaceae, with the aim to clarify its familiar and generic placement, and to test the proposal of R. Ochyra, who kindly studied the material, to describe it as a new species of Platyhypnidium. Botanica Helvetica 111/2,2001 141 (N en in ON i> in en ON ON. NO 00 m t> NO ON CS T-H 00 ON. o ono o ON o ON Oo-f 00 NO t-h ON On On ON ON s- in O O in o oON en S3 o o On ^h en en ON Oo Oo On On 00 o ON On o o T-H NO o o NO À CS 00hh00 TO ^<N t-H t-H hooo Sil CS ON O t-h O O t-H t-H o o no no ÇN ITj en en en m no m cs no en en en en cs en en en en cs in I S T—H HnS ; -1 CS CS ° T-H T-H O es cs CS CS T-H PfN t-H O es es cs cs cs p o £ £ £ Ph PH £ £ P. 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