Taxonomy and Geography of Sphagnum tundrae With a Description of S. mirum,<i>sp. nov.</i>(Sphagnaceae, sect. Squarrosa)

Flatberg, Kjell Ivar; Thingsgaard, Karen

doi:10.1639/0007-2745(2003)106[501:tagost]2.0.co;2

Cited by 19 publications

(15 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The molluscs disappeared at about 3800 years BP. Pollen studies have shown higher abundance of Cassiope tetragona (Hyvärinen 1972); macrofossils of thermophilous species have been found (Birks 1991), as well as a postulated occurrence of fertile Sphagnum species during warmer periods (Flatberg & Thingsgaard 2004).…”

Section: Quaternary Geology and Glaciologymentioning

confidence: 99%

The lichen flora of Svalbard

2009

View full text Add to dashboard Cite

. 742 species, including 151 reported for the first time, are treated from Svalbard (exclusive of Bjørnøya). New to science are: Bryocaulon hyperborea Øvstedal (also known from Greenland), Buellia insularis Øvstedal, Lepraria svalbardensis Tønsberg, Placynthium pulvinatum Øvstedal (also recorded from mainland Norway), Rhizocarpon dahlii Øvstedal, R. tephromelae Øvstedal, and Tephromela lucifuga Øvstedal & Tønsberg. New combinations are: Aspicilia major (Lynge) Øvstedal, Aspicilia punctiformis (Lynge) Øvstedal, Cetraria racemosa (Lynge) Øvstedal, Miriquidica picea (Lynge) Øvstedal, and Stereocaulon compactum (I. M. Lamb) Øvstedal. Information on morphology, anatomy, chemistry, substrate preferences and distribution is included for all taxa. Keys to genera and species are provided. Separate keys are provided for sorediate species on rock and on soil/bryophytes. 6 % of the species are defined as cosmopolitan. More than one third has a bipolar distribution, whereas about 60 % are restricted to the Northern Hemisphere, 52 species are high-arctic and lacking from Fennoscandia, and 12 species are at present known as Svalbard endemics.

show abstract

Section: Quaternary Geology and Glaciologymentioning

confidence: 99%

The lichen flora of Svalbard

2009

View full text Add to dashboard Cite

show abstract

“…Considering the enormous number of spores produced along with the efficient ‘air‐gun’ spore spreading mechanism (Sundberg, ), the number of Sphagnum spores that are dispersed even between continents must be quite high each year. Sundberg () trapped spores in the arctic archipelago of Svalbard where Sphagnum species never have been observed with sporophytes (Flatberg & Thingsgaard, ), and estimated that as much as 1% of the ‘spore rain’ had continental origin.…”

Section: Introductionmentioning

confidence: 99%

Long‐distance dispersal and barriers shape genetic structure of peatmosses (Sphagnum) across the Northern Hemisphere

Kyrkjeeide

Hassel

Flatberg

et al. 2016

Journal of Biogeography

View full text Add to dashboard Cite

Aim Disjunctly distributed peatmosses (Sphagnum) have been found to exhibit little genetic structure over regional and intercontinental scales, mainly caused by high ability for transoceanic long-distance dispersal. Although, most Northern Hemisphere peatmoss species have wide circumboreal/nemoral ranges, little is known about the magnitude and effects of long-distance dispersal and barriers in shaping the genetic structure of such species. We investigate whether high dispersal capacity has caused genetic homogeneity across broad areas of the Northern Hemisphere, or whether barriers act to shape genetic structure across different species with similar distributional ranges.Location Northern Hemisphere.Methods We studied genetic variation and structure in six Sphagnum species using 19 microsatellite loci.Results Four out of six species were genetically structured in similar ways; with mainly one Beringian and one Atlantic group. Overall, both the North American and Eurasian continents seemed to act as a barrier to gene flow in several species. However, the most abrupt breakpoint between genetic groups was found in south-east Alaska. Main conclusionsWe found evidence for extensive gene flow between regions across the Northern Hemisphere among peatmosses, with oceans seemingly acting as weaker barriers to gene flow than landmasses. Plants from the amphi-Atlantic and amphi-Beringian regions of several species were genetically differentiated. Similar genetic structuring across several species, indicate that spore-producing species do not disperse freely across their entire distributional range, but are likely limited by wind directions, landmass barriers and/or habitat availability.

show abstract

“…Scale bars: 5 mm for 1; 1 mm for 3-6; 100 μm for 2, 7-12. Flatberg & Thingsgaard (2003), the most prominent morphological characters of S. mirum are chlorophyllous cells in transverse section elliptical to elliptical-rectangular, broadest in middle part, broadly enclosed on both surfaces vs. triangular to ovate-triangular, broadest near convex surface (S. teres) and elliptic to elliptic-ovate, broadest at some distance apart from the convex surface (S. tundrae); distinctly papillose inner surface of hyaline cells where facing chlorophyllous cells vs. less distinctly papillose in both S. teres and S. tundrae; pendent branch leaves markedly shorter than divergent branch leaves vs. not markedly shorter ones in both S. teres and S. tundrae. The main difference between S. mirum and S. teres includes opposide position of pores in hyaline cells in proximal part of branch leaves: S. mirum has aporose hyaline cells on convex surface and large faint pores on concave side, while in S. teres pores are present on convex side and absent on concave one.…”

Section: Sphagnum Mirummentioning

confidence: 99%

“…Sphagnum mirum was recently described from Alaska (Flatberg & Thingsgaard 2003) based on material collected from one locality in the Bethel area. In 2007 it was collected by the first author from one locality in the Nunavik area, arctic Canada (62°22'57''N -77°52'15.9''W; TRH B-727552-54).…”

Section: Sphagnum Mirummentioning

confidence: 99%