s A Field Guide to the British Seaweeds - NMBAQC

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Gelidium sp. Gracilaria gracilis Species quite variable in size and shape but plants are generally flesh and cartilaginous. G. pusillum tends to have narrow fronds which are cylindrical but may be compressed in parts, it is dark red/black and wiry with variable branching but often arranged in two opposite rows. G. latifolium and G. sesquipedale are slightly broader and more foliose with regularly flattened fronds and redder in colour. All species tend to creep over the rock surface, in crevices and overhangs forming mats, and are located in the mid to lower littoral. Not to be confused with Catenella caespitosa. G. latifolium showing broader compressed frond Gelidium pusillum in natural habitat and under magnification Plants filiform, cartilaginous and slightly elastic growing up to 60cm long and 1-3mm wide. Branching is generally irregular but secund at times and may be quite dense in some plants often giving a straggly appearance. It is usually dark brown in colour although may turn green on bleaching. This species is quite tolerant of sand and can be located in the lower littoral and sublittoral fringe and within rockpools attached via a discoid holdfast. General form of Gracilaria
Halurus flosculosus Plant consisting of uniseriate filaments of cylindrical cells often slightly swollen at each end with apices narrow and pointed. Plant tends to be slightly rigid with the texture of coarse hair, with worn plants appearing tatty. It is bright red/pink in colour and grows up to 20cm long. It is highly and dichotomously branched with reproductive bodies extending from special branches; these are also often surrounded by small incurved branchlets or ramuli. Rhizoidal branches may be present in muddy substrates. Found mainly in the mid to lower littoral within rockpools and in the sublittoral fringe. Long hair-like filaments of H. flosculosus with incurved branchlets surrounding reproductive bodies Halurus equisetifolius Plant filamentous consisting of main axis numerously covered with closely packed and densely whorled uniseriate branches, which are short and incurved giving a bottle brush appearance. Main axis branching is limited and irregular. Generally quite coarse in nature and dark red in colour growing up to 20cm long. It is located in the lower littoral and sublittoral fringe on rock surfaces. Spongy appearance through covering of small Whorled branches may resemble a bottle brush.
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A Field Guide to the British Seawee
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INTRODUCTION The EU Water Framework
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- Turfs of mixed species including
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Some species have distinct vertical
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Table 1: Field sampling sheet to re
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Table 2: Species lists for each of
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The varieties of algae forms are br
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Special features that need to be co
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• Reproductive structures - these
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Axial cell • Distal- Towards the
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A FIELD KEY TO THE BRITISH SEAWEEDS
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Rhodophyta The red algae exhibit a
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Group A 1. Plants completely flatte
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Phaeophyta Species Group A Plants a
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8. Thallus consisting of a large wi
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Group D 1. Plant dichotomously bran
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Group A 1. Plant calcareous……
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10. Plant completely flattened ofte
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11. Plant black and wiry with disc-
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3. Plant generally found attached t
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Browns Alaria esculenta Ascophyllum
Page 43 and 44: Ceramium nodulosum Ceramium shuttle
Page 45 and 46: Polysiphonia fucoides Polysiphonia
Page 47 and 48: Blidingia sp. This is a tubular and
Page 49 and 50: Chaetomorpha linum This is an unbra
Page 51 and 52: Chaetomorpha melagonium This is an
Page 53 and 54: Enteromorpha sp. A tubular plant wh
Page 55 and 56: Rhizoclonium tortuosum Plant consis
Page 57 and 58: Sykidion moorei Plant consisting of
Page 59: Ulva lactuca A flat foliose plant t
Page 62 and 63: Ascophyllum nodosum Frond very long
Page 64 and 65: Chordaria flagelliformis Plant ofte
Page 66 and 67: Desmarestia aculeata Frond often qu
Page 68 and 69: Ectocarpus sp. Fine filamentous for
Page 70 and 71: Fucus sp. Plants tough, cartilagino
Page 72 and 73: Laminaria sp. Thick leathery, very
Page 74 and 75: Litosiphon laminariae Epiphytic pla
Page 76 and 77: Pilayella littoralis Fine filamento
Page 78 and 79: Scytosiphon lomentaria Plant charac
Page 80 and 81: Spongonema tomentosum Fine and fila
Page 82 and 83: Ahnfeltia plicata Plant completely
Page 84 and 85: Calcareous encrusters Calcareous en
Page 86 and 87: Ceramium nodulosum This is a highly
Page 88 and 89: Chondrus crispus This species is ca
Page 90 and 91: Cystoclonium purpureum This is a fi
Page 92 and 93: Erythrotrichia carnea This is a sma
Page 96 and 97: Heterosiphonia plumosa Plant filame
Page 98 and 99: Lomentaria clavellosa This plant is
Page 100 and 101: Hypoglossum hypoglossoides This spe
Page 102 and 103: Melobesia membrancea This is a smal
Page 104 and 105: Osmundea hybrida and Osmundea pinna
Page 106 and 107: Phyllophora sp. Plant tough, cartil
Page 108 and 109: Polysiphonia fucoides Plants are ge
Page 110 and 111: Porphyra species These plants are f
Page 112: Rhodothamniella floridula This plan
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s A Field Guide to the British Seaweeds - NMBAQC

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