s A Field Guide to the British Seaweeds - NMBAQC

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Polysiphonia fucoides Plants are generally dark red to black in colour growing up to 30cm long and quite coarse in texture. Branching is irregular and tends to be concentrated towards the upper portions of the plant often appearing scraggy. It is a polysiphonous species consisting of 12-20 siphons with a small covering of cells occasionally in the lower fronds. It is very common throughout the littoral found in numerous habitats. Polysiphonia lanosa P. Lanosa is dark purple to black, filamentous, it can grow up to 8cm long and is often quite coarse . It is a polysiphonous species consisting of 12- 24 siphons around a prominent central siphon or cell, with distinct dichotomous branching often appearing quite tufted. It only grows epiphytically on Ascophyllum on the upper and mid littoral and this is used to distinguish it from other species of Polysiphonia. P. fucoides in natural habitat, its general morphology and showing the 12 secondary siphons P. lanosa with dichotomous branching, growing on Ascophyllum, and showing numerous siphons with distinct central siphon
Polysiphonia spp. These plants are filamentous and polysiphonous but will vary considerable between species. The colour may be light pink to deep red and purple or black. The number of primary siphons range from 4 to 24 and depending on the species secondary siphons may also be present. These characteristics are used to distinguish between species. Cystocarps Secondary siphons Some Polysiphonia species may only have 4 to 6 primary siphons others may have secondary siphons present, often the central siphon cannot be easily seen Reproductive bodies may be present as cystocarps or tetraspores Tetraspores They may be found in a number of habitats throughout the littoral including rockpools, overhangs and crevices and may also be located in amongst turf formers. Shape, size and location of the reproductive bodies are also quite variable.
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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
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Ceramium nodulosum Ceramium shuttle
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Polysiphonia fucoides Polysiphonia
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Blidingia sp. This is a tubular and
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Chaetomorpha linum This is an unbra
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Chaetomorpha melagonium This is an
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Enteromorpha sp. A tubular plant wh
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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 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 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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