s A Field Guide to the British Seaweeds - NMBAQC

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Osmundea hybrida and Osmundea pinnatifida Both these species are very cartilaginous and fleshy and dark red-brown in colour but can appear yellowish when bleached. Branching pattern varies according to species. O. hybrida has branching from all round the main axis which tends to be alternate or opposite. It is generally cylindrical but may be slightly compressed in parts and can grow up to 15cm long with a discoid basal attachment. In contrast O. pinnatifida tends to be more compressed with branches in a single plane only with slightly wider fronds. Microscopic examination will reveal a groove in the frond tip and a stoloniforous holdfast. O. Hybrida has a terminal pit rather than a groove. Both species are located in the mid through to sublittoral region and tends to be found in amongst turfs in crevices or overhangs and on the sides of rockpools, often found together. Cylindrical arrangement of branches and discoid holdfast on O. hybrida Compressed form of O. pinnatifida, with single plane branching, also showing its wide frond morphological form in its natural habitat
Palmaria palmata Plant foliose, fleshy and thin but slightly tough and elastic. Fronds are quite broad and long often wedge shaped and small blades arise from the frond margins. It is very variable in shape and size, some with very broad and undivided fronds and others with long thin and much branched fronds, but branching is generally variable and irregular. Plant is dark red in colour and can grow up to 30cm long. It is commonly found in the lower littoral and sublittoral fringe within pools and on open rock surface also frequently found attached to kelp stipes. Phycodrys rubens Plant with midrib and side veins very distinct throughout. General morphology is thin, membranous, delicate and foliose resembling an elongated oak leaf with notched frond edges and may be up to 9cm wide and 20cm long. Branching variable and generally from main stipe. Found in the lower littoral and sublittoral and often attached to kelp stipes. Not to be confused with Delesseria. Palmaria showing highly branched form Phycodrys with distinct midrib and veins and branching from main stipe
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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
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 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 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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