s A Field Guide to the British Seaweeds - NMBAQC

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Hypoglossum hypoglossoides This species is foliose, very delicate, and membranous, light pink in colour and growing up to 20cm long and 4mm wide. Its may characteristic features are the presence of a distinct midrib from which bladelets arise. The fronds are pale pink and narrow with pointed tips and may be variously branched. It is commonly found in the lower littoral often under overhangs and in the sublittoral fringe. Not to be confused with similar branched foliose species with midribs such as Membranoptera sp. and Apoglossum sp. Delicate and membranous nature of Hypoglossum showing branches extending from central midrib only and with slender and pointed apices Lomentaria articulata The main characteristic of this species is its clearly beaded appearance. It is very fleshy, soft and bright pink/red in colour and has prominent constrictions at regular intervals along the frond creating elongated oval segments. Branching can be quite dense, it is often dichotomous and may be both whorled or opposite generally extending at right angles from the main axis. It is found throughout the littoral particularly in overhangs and within mats or turfs. Also commonly located on the sides of rockpools. Generally very common. Lomentaria in its natural habitat and showing its distinct beaded appearance
Lomentaria clavellosa This plant is very fleshy, soft and rose pink in colour and growing up to 15-30cm long depending on local conditions. Branching pattern is generally irregular, numerous with branches constricted at the base. General form may vary according to level of exposure; in exposed conditions branching tends to be pinnate appearing flattened, but in sheltered areas branching is much more variable and luxuriant. It is found throughout in lower littoral pools down to the sublittoral and may also grow on sandy or muddy substrates. Natural form of Mastocarpus showing variable colour, presence of cystocarps and channelled frond Reproductive body of L. clavellosa showing constrictions at base of branches and its general form Mastocarpus stellatus Plant cartilaginous and tough, deep red in colour although often turning greeny brown on bleaching and growing up to 17cm in length. The frond is sometimes quite broad but narrows at the base and is in-rolled causing a channel-like appearance, though channelling may be slight. The frond may also be covered in reproductive bodies (cystocarps) present as small knobbles. Plants may be quite variable in morphology with some appearing twisted and with regularly dichotomous branching. It can be found throughout the littoral although is most common on the lower shore. Not to be confused with Chondrus crispus, which is very similar in morphology but is completely flattened.
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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
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 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 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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