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Ulva lactuca

( NO:Havsalat ENG:Sea lettuce)                  4 photos (see below for more photos)


Habit
Photo by: Kjersti Sj√łtun
Location: Espegrend, Raunefjorden, Hordaland
Photo is showing (categorized): Thallus
Verified by Network members
Sampling date: 2010-05-27
Published: 2010-10-04

Blade-like appearance of thallus

The species is most common in the upper subtidal and lower intertidal. Thallus is blade-like and consists of two cell layers (distromatic), and can be roundish, elongated or lobed. The margins are usually frilly, but do not have a toothed (serrated) edge like Ulva rigida has. In attached specimens the frond has rhizoidal cells towards the base. These are different from the other vegetative cells by being darker and normally larger, and usually they have several pyrenoids. Vegetative cells have a single, parietal chloroplast, usually with 1 pyrenoid, but some cells can have 2-3 pyrenoids.




Rhizoidal cells of stem
Photo by: Kjersti Sj√łtun
Location: Espegrend, Raunefjorden, Hordaland
Photo is showing (categorized): Cells
Verified by Network members
Sampling date: 2010-05-27
Published: 2010-10-04

The rhizoidal cells are darker and normally also larger than the other vegetative cells




Surface view of vegetative cells
Photo by: Kjersti Sj√łtun
Location: Espegrend, Raunefjorden, Hordaland
Photo is showing (categorized): Cells
Verified by Network members
Sampling date: 2010-05-27
Published: 2010-10-04

Cells are rectangular or polygonal with rounded corners. Each cell has a lobed, parietal chloroplast, with 1 (2-3) round pyrenoids




Surface view of one layer of vegetative cells
Photo by: Kjersti Sj√łtun
Location: Espegrend, Raunefjorden, Hordaland
Photo is showing (categorized): Cell structure
Verified by Network members
Sampling date: 2010-05-27
Published: 2010-10-04

Each cell with a parietal and lobed chloroplast



 

     

     

     

     

     

     

     

     

     

     

     

     

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