Chromista › rockweeds
Knotted Wrack
Ascophyllum nodosum
28 photos
Study shows up to four per card, from different observers, so you learn the species rather than one picture. Heart the good ones and swap any you do not like.
Photos you add are credited to you, and you keep the copyright.
Easily confused with
bladder wrackFucus vesiculosus
RockweedFucus distichus
Golden RockweedSilvetia compressa
Spiral WrackFucus spiralis
Channelled WrackPelvetia canaliculata
Japanese WireweedSargassum muticum
Sea-oakHalidrys siliquosa
Giant KelpMacrocystis pyrifera
Study checks a spoken answer against these, and tells you which one you named.
Where it is recorded
| United States | 35,972 |
|---|---|
| Alaska | 25,590 |
| Canada | 6,326 |
| Maine | 2,343 |
| Nova Scotia | 1,713 |
| Quebec | 1,684 |
| Massachusetts | 1,406 |
| United Kingdom | 1,150 |
| New Brunswick | 751 |
| England | 493 |
Counts show where people looked, not only where it lives.
Classification
| Kingdom | kelp, diatoms, and allies · Chromista |
|---|---|
| Phylum | Ochrophyta |
| Class | brown algae · Phaeophyceae |
| Order | Fucoids · Fucales |
| Family | rockweeds · Fucaceae |
| Genus | Ascophyllum |
Sources
- Names, taxonomy and observation counts: www.inaturalist.org
- Photos and recordings: the creator and source are on each one.
- How much to rely on each source
Remember the name next time.
Practise Knotted Wrack with real photos from different observers. Say the name out loud, and it comes back just before you would forget it.