s A Field Guide to the British Seaweeds - NMBAQC

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Phyllophora sp. Plant tough, cartilaginous and foliose, it is variable in size depending on the species often with a prominent, narrow, cylindrical and long stipe. Plants may be broad and fan shaped or with long narrow fronds. Branches and division variable often with simple blades extending from frond margin with narrowing at branch base with an interrupted and indistinct midrib. Found in the lower to sublittoral fringe on a range of substrate types and often attached to kelp stipes. Plocamium cartilagineum Plant is rose pink in colour, filamentous, highly branched and slightly delicate. Its main characteristic feature is the distinct comb-like (secund) branching that occurs throughout the plant. The fronds tend to be flattened but may appear very bushy due to numerous branching; growing up to 3mm wide and 15cm long. It is found in the lower littoral and sublittoral often around kelp stipes. P. Traillii with short terete stipe and with numerous branchlets extending from frond margins Plocamium with comb-like branching and showing natural highly branched and bushy morphology
Plumaria plumosa This species is dark purple and filamentous with a soft, fine, and very delicate morphology consisting of numerous branches and growing up to 10cm long. The plant is generally monosiphonous but lower portions may be covered in small cells. Branches are both long and short although these are not regularly alternate and may appear tatty in older plants. They are commonly found in amongst mats on both vertical rock and within overhangs in the mid but mostly lower littoral. Not to be confused with Ptilota gunneri. Polyides rotundus Plants are cartilaginous and tough, completely terete throughout and usually dark red or black in colour. Its branching is generally quite regular and dichotomous and tends to be more highly branched towards the apices which taper to a point. This species is very tolerant of sand and is most commonly found in sandy rockpools attaching with a discoid holdfast. Easily confused with Furcellaria and requires basal portion for correct identification. Polyides showing terminal dichotomous branching and discoid holdfast Plumaria with long and short branches, in its natural habitat and showing monosiphonous fronds
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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
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 104 and 105: Osmundea hybrida and Osmundea pinna
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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