Species:
Dasysiphonia japonica (Yendo) H.-S. Kim
Japansk sjølyng, japansk straumgarn in Norwegian Nynorsk
Japansk sjølyng, japansk strømgarn in Norwegian Bokmål
Classification
The species Dasysiphonia japonica belongs to:
Photos
Photos of Dasysiphonia japonica (11):
1 of 11: 12 cm specimen in February
Heterosiphonia japonica is an alien species with Pacific origin (Korea, Japan), first observed in Skårsundet near Bergen in 1996. The species was first called Dasysiphonia sp. when arriving in Europe, and the taxonomic status is still unclear.
H. japonica is presently distributed along European coast from Italy in the Mediterranean Sea to the northwest coast of southern Norway. In Norway it thrives in a wide range of habitats, except at very wave exposed shores.
Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2006-02-10
- Published
- 2007-11-22
- Photo is showing (categorized)
2 of 11: Branching
Polysiphonous axes with sympodial growth carrying short monosiphonous pseudolateral (short branclets with determinate growth). Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Sampling date
- 2006-02-07
- Published
- 2007-11-22
- Photo is showing (categorized)
3 of 11: In some specimens the peraxial cells are spirally arranged
- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2005-08-22
- Published
- 2007-11-22
- Photo is showing (categorized)
4 of 11: Axis with four peraxial cells carrying pseudolaterals from each segment.
Sometimes the pseudolaterals can be reduced to a 1-3 celled remain of aborted branches (vegetative reproduction). Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2006-02-10
- Published
- 2007-11-22
- Photo is showing (categorized)
5 of 11: Apices showing uncorticated monosiphonous (one cell row) pseudolaterals.
- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2006-02-10
- Published
- 2007-11-22
- Photo is showing (categorized)
6 of 11: Cross section of axis showing axial cell surrounded by four axial cells and smaller medullar cell
At basis of old branches the medullar cells sometimes are so large that they might be mistaken for peraxial cells. These cells are called pseudo-peraxial cells by Barbara (2003). Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2005-08-22
- Published
- 2007-11-22
- Photo is showing (categorized)
7 of 11: Tetrasporangial stichidia
At the Norwegian coast the tetrasporophytes are fertile in the period from May to October. Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2005-08-22
- Published
- 2007-11-22
- Photo is showing (categorized)
8 of 11: Cystocarp, specimen from northern Spain
Fertile gametophytes have rarely been observed in the European populations. A few fertile gametophytes (both male and female) were found in the Netherlands in May 2004 (Herre Stegenga, pers. comm), and fertile female specimens have been observed in northern Spain several years during the summer (Viviana Peña pers. comm.).
Photo: Viviana Peña
Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Viviana Peña
- Sampling location
- Rio Arusa, Northern Spain
- Sampling date
- 2004-08-22
- Published
- 2007-11-22
- Photo is showing (categorized)
9 of 11: Cystocarps on female specimens from northern Spain
- Species
- Dasysiphonia japonica
- Verified by
- Viviana Peña
- Sampling location
- Rio Arusa, Northern Spain
- Sampling date
- 2004-08-22
- Published
- 2007-11-22
- Photo is showing (categorized)
10 of 11: Monosiphonous basal cell of pseudolateral
The species can be distinguished from Heterosiphonia plumosa by the number of peraxial cells (4 in H. japonica versus 9-10 in H. plumosa). H. plumosa is carrying side branches or pseudolaterals from each second or third segment of the axis, while H. japonica is carrying pseudolaterals from each segment. Additionally the thallus of H. plumosa is arranged in a more complanate way than H. japonica.
Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2006-02-10
- Published
- 2007-11-22
- Photo is showing (categorized)
11 of 11: Left: Cortication in middle part of branches. Right: Dense cortication at basal parts of branches
While distal part of the thallus is uncorticated showing 4 peraxial cells, cortication is increasing towards the basal parts. Photo: © Vivian Husa Terms of use- Species
- Dasysiphonia japonica
- Verified by
- Bergen Seaweed Group
- Sampling location
- Raunefjorden, Hordaland
- Sampling date
- 2005-08-22
- Published
- 2007-11-22
- Photo is showing (categorized)
