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PHAEOPHYCEJE (Olive Brown Seaweeds). 
Halidrys siliquosa Lyiigb, (Podded sea-oak). — Common in all pools 
between tide-ma.rks. 
Fuciis vesicnlosus, L. (Bladder wrack). — Very common on rocks and 
stones between tide-marks. 
Fumis ceranoides, L. (Horn wrack). — Smuggler’s Cave, Cullercoats, 
and other places. 
Fucus serraitis, L. (Serrated wrack). — Very common in Cullercoats 
bay, less so to the north of it. 
PAicus nodosus, L. (Ki^o^^ked wrack). — Very common on rocks near 
low water, usually more or less covered by Polysiphonia fastigiata. 
FUmanthalia lorea (L.) Lyngb (Sea thong). — Common at low water 
mark : not yet brought to me from the Durham coast. 
Desmarestia viridis, Lamour. — Not common. 
Alaria esculenta (L.), Grev (Badderlocks). — Fairly common near low 
water. 
Laminaria dujitata (L.), Lamour (Tangle). — Very common in deep 
water and variable in appearance : the largest of our native 
seaweeds. 
Laminaria saccharina (L.), Lamour (Sugary tangle). — Common 
between tide-marks. 
Chordaria flageUiformu, Agardh. — Fairly common. 
Elachista fucicola, Fries. — Very common on Fucus vesicnlosus, less 
frequently on F. serratus. 
Cladostcphiis verticillatus, Agardh. — Not very common in pools 
between tide-marks. 
Ectocarpus tomentosus, Lyngb. — On stems of larger weeds : not very 
common. 
Ectocarpus iittoralis, .J. Ag. — Very common on rocks and on other 
weeds. 
CHLOROPHYCEAE ^Green Seaweeds). 
Cladojdiora rupestris, Kiitz. — Common on rocks near low water. 
Cladopthora laeLevirens, Kiitz. — Common in pools between tide-marks. 
Enteromorpha intestinalis (L.), Link. — Very common above half tide- 
mark : often swollen by gas, hence its name. 
Enteromorpha compressa (L.), Grev (Sea grass). — Very common on 
rocks, shells, wood, &c., near high tide-mark. 
Ulva latissima, Kiitz (Sea lettuce or laver). — Very common between 
tide-marks. 
