Purple Laver

Porphyra umbilicalis Greenish in colour when young, but becoming purple-red as it matures, and is very resistant to drying out and the action of the waves. It forms thin, delicate sheets which cling to rocks and has a polythene-like texture. Width 20cm. Found attached to rocks in sandy habitats. Abundant and widespread on rocky shores... Continue Reading →

Sea Belt

Saccharina latissima Also called ‘Sugar Kelp’ or ‘Poor Man’s Weatherglass’, this is a long, belt-like brown to olive coloured seaweed with wavy edges and a crinkled centre. Length 4cm. It grows in deep pools and around the low tide mark, usually on sheltered rocky shores attached to rocks with a small branching holdfast. A common... Continue Reading →

Egg Wrack Wool

Polysiphonia lanosa A brownish-red seaweed which is tufted and made up of branching filaments which gives it a wool-like consistancy. Length 70cm. Found middle to low shore, and grows mainly on Egg Wrack (Ascophyllum nodosum) for physical support, known as an epiphyte. It makes use of the hosts buoyancy at high tide so it will... Continue Reading →

Toothed Wrack

Fucus serratus Also called “Saw Wrack’ or ‘Serrated Wrack’, this is an olive to golden brown seaweed, flattened with a prominant midrib and saw-toothed fronds.  Length 60cm. Frond width 2cm. Found on the lower zone, it latches onto rocks on more sheltered shores. A common and widespread species. Photographs of Toothed Wrack (Fucus serratus), taken... Continue Reading →

Spiral Wrack

Fucus spiralis Also called ‘Flat Wrack’, it is a dark olive-brown or greenish seaweed with a prominent midrib with no gas bladders. There are often pairs of swollen reproductive bodies on the tips of the frond branches. The fronds have a tendency to twist. Length 15 to 20cm. Occurring on the upper shore, preferring sheltered... Continue Reading →

Channelled Wrack

Pelvetia canaliculata This seaweed is dark greenish-brown in colour when dry and yellow when wet. It has no gas bladders, the fronds have no midribs, and they are curled along the length forming a channel. Height 15cm. Found on the upper shore attached to rocks. Reproduces from August to September. It is very resiliant to... Continue Reading →

Egg Wrack

Ascophyllum nodosum Also called ‘Knotted Wrack’, this is a yellowish to olive-green seaweed, which has long, narrow chain-like fronds with gas-filled bladders. This is a slow-growing seaweed which has no mid-rib. Height 0.5 to 2m. Found on rocky shores, often on the mid-shore, preferring sheltered conditions, extending into estuaries and usually attached to rocks. It... Continue Reading →


Ulva intestinalis This aptly named bright grass green seaweed forms an inflated, tube-like frond which resembles an intestine. Length up to 80cm. Found attached to rocks and stones on sandy or muddy shores, in sheltered estuaries and rock pools on the upper shore. A common and widespread species. Photographs taken April 2013, Llandudno, Wales, and... Continue Reading →

Sea Lettuce

Ulva lactuca A pale to dark green seaweed, which has no midrib. It has wavy edges and translucent green fronds.  Length 40cm. The Sea Lettuce is tolerant of most conditions, except extreme exposure. It is found throughout the intertidal zone on rocky shores, estuaries, and free-floating. It may also be discovered attached to rocks or... Continue Reading →

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