s A Field Guide to the British Seaweeds - NMBAQC

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Erythrotrichia carnea This is a small, filamentous and unbranched species which is found growing epiphytically on a range of red, green and brown species. The filament can be several cells long and extends from a small multicellular disc. It is often very pink in colour and may be distinguished from other microscopic filamentous species by its stellate (star shaped) chloroplast. Not to be confused with Audouinella sp. which are often shorter in length, branched and may have hairs or with Bangia atropurpurea. Furcellaria lumbricalis Plants completely cylindrical, cartilaginous and quite tough and dark red/brown in colour but tips may turn green in older plants. Branching is regularly dichotomous and tends to be most dominant at the apices which tend to taper appearing fork-like. This species can grow up to 30 cm long and 1-2 mm thick. It is often confused with Polyides but may be distinguished by its claw-like basal attachment. It is most frequently located in sandy bottomed pools in the lower littoral. Furcellaria with claw-like holdfast, with dichotomous branching and forked apices and in natural habitat, Uniseriate unbranched filament of Erythrotrichia General form of Furcellaria
Gastroclonium ovatum Plant filiform and completely cylindrical throughout also quite cartilaginous and fleshy. The most characteristic feature is the presence of small bulbous sacs which are bunched together at the frond tips. Branching is irregular and generally restricted to the upper portions of the plant with limited branching at the base although many fronds may arise directly from the base. It grows up to 25cm long and is generally brownish red in colour although it often bleaches to brownish yellow. It is located on rock surfaces in the lower littoral and sublittoral fringe. Plant showing sparsely branched frond with numerous sacs on the upper portions of the frond
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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
Page 41 and 42: 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 94 and 95: Gelidium sp. Gracilaria gracilis Sp
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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