New records ofSpirogyraandZygnema(Charophyceae, Chlorophyta) in New Zealand

Abstract

Filamentous zygnematalean algae frequently dominate periphyton assemblages in New Zealand streams, yet only 10 reliable species records of the most common genera, Spirogyra and Zygnema, exist. One of these species, S. clavata, was found again in a new survey of stream habitats, mainly in the South Island. Ten further species (nine of Spirogyra and one of Zygnema) are also described and identified. Morphology and interfertility are affected by polyploid series in Spirogyra, making current species concepts unsatisfactory. Identifications in this study emphasise zygospore ornamentation, which is the most stable and conserved character known.

Molecular and morphological diversity of Zygnema and Zygnemopsis (Zygnematophyceae, Streptophyta) from Svalbard (High Arctic)

“…Consequently, studies describing the diversity of these algae are limited to records of fertile samples (Novis, 2004; Poulíčková et al ., 2007; Kim et al ., 2012; Stancheva et al ., 2012). Novis (2004) reported only one fertile specimen (i.e. one species) of Zygnema from New Zealand.…”

Morphology and plastid psbA phylogeny of Zygnema (Zygnemataceae, Chlorophyta) from Korea: Z. insigne and Z. leiospermum

“…Molecular studies of Zygnema began with phylogeny of the family Zygnemataceae, in which plastid rbcL and nuclear small subunit of ribosomal gene (SSU rDNA) were analyzed for a few species (McCourt et al 1995, 2000, Gontcharov et al 2003, 2004, Hall et al 2008. Recently, Stancheva et al (2012) gave an intensive phylogeny of Zygnema from California, based on the cox3 and rbcL genes, recognizing two clades within the genus.…”

“…Since the description of Zygnema by J. Agardh (1824), more than 150 species have been described by taxonomic studies (Randhawa 1959, Kadlubowska 1984, Rundina 1998, Novis 2004, Zarina et al 2006. Morphological criteria such as vegetative cell size, details of sexual reproduction, shape, dimension and color of zygospores, and ornamentation of the median spore wall are important in the identification of species (Randhawa 1959, Kadlubowska 1984, Johnson 2002 -43-276-6180, Fax: +82-43-275-2291 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.…”

“…Agardh (1824), more than 150 species have been described by taxonomic studies (Randhawa 1959, Kadlubowska 1984, Rundina 1998, Novis 2004, Zarina et al 2006. Morphological criteria such as vegetative cell size, details of sexual reproduction, shape, dimension and color of zygospores, and ornamentation of the median spore wall are important in the identification of species (Randhawa 1959, Kadlubowska 1984, Johnson 2002.…”

“…The strains in both culture and nature. For example, the variation of cell width in Z. circumcarinatum clones was much higher than expected (Miller and Hoshaw 1974), and these ploidal variants in clonal culture and field collected materials have led to a proliferation of species diversity in Zygnemataceae (McCourt and Hoshaw 1990).Molecular studies of Zygnema began with phylogeny of the family Zygnemataceae, in which plastid rbcL and nuclear small subunit of ribosomal gene (SSU rDNA) were analyzed for a few species (McCourt et al 1995, 2000, Gontcharov et al 2003, 2004, Hall et al 2008. Recently, Stancheva et al (2012) gave an intensive phylogeny of Zygnema from California, based on the cox3 and rbcL genes, recognizing two clades within the genus.…”