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 A HISTORY OF CORNWALL SPHACELARIACEJE Sphacelaria radicans, Harv. Par, Prid- mouth, Falmouth, Penzance, Sennen Cove olivacea, Pringsh. Par, Pridmouth cirrhosa, Ag. Fa/mouth, Lizard var. pennata, Hauck. Looe, Padstow, Fa/mouth, Penzance var. fusca, Holm. & Batt. Padstow, Fa/mouth, Penzance, Land's End Halopteris *filicina, Ktttz. Boscastle, Pad- stow, Looe, Falmouth, Penzance Stypocaulon scoparium, Kutz. Loot, Pad- stow, Falmouth, Penzance, Scilly Isles MYRIONEMACEJE Myrionema *aecidioides, Sauv. Falmouth Ulonema rhizophorum, Fosl. Falmouth, Lizard Chilionema *Nathaliae, Sauv. Looe Ascocyclus orbicularis, Magn. Scilly Isles Ralfsia clavata, Crn. Fowey, Falmouth, Penzance CHORDARIACE.S Spermatochnus *paradoxus, Rke. Torpoint, Falmouth Stilophora *Lejolisii, Rke. Looe, Falmouth (?) Chordaria divaricata, C. Ag. Falmouth Mesogloia *G'riffithsiana, Grev. Falmouth, Penzance Castagnea Zosterae, Thur. Penzance, Scilly Isles Petrospongium *BerkeIeyi, N2g. Boscastle, Padstow, Looe, Penzance SPOROCHNACE.S: Sporochnus *pedunculatus, C. Ag. Tor- point, Falmouth Carpomitra *Cabrerz, Ktitz. Fowey, Pen- ^ zance CHORDACE.E Chorda filum, Stackh., var. thrix, W. Hook. Penzance LAMINARIACE^ Laminaria saccharina, Lamx. Fowey, Falmouth, Penzance var. phyllitis, Le Jol. St. Minver, Looe Saccorhiza bulbosa, De la Pyl. Cawsand, Fowey, Looe, Padstow, Falmouth, Penzance Alaria esculenta, Grev. Boscastle, Fowey, Falmouth, St. Ives, Padstow, Lizard, Penzance, Land's End CUTLERIACEJE, Thur. Cutleria multifida, Grev. Falmouth f. reptans, Reink. Fowey, Padstow, Falmouth, Penzance FUCACEJE Fucus ceranoides, Linn. Fowey, Falmouth FUCACE.S: (continued) Fucus platycarpus, Thur. Fowey, Penzance var. spiralis (Linn.) Fowey, Falmouth vesiculosus, Linn., var. sphaerocarpus, J. Ag. Cornwall serratus, Linn., var. angustifrons, Stackh. Falmouth var. integer, Turn. St. Ives Bifurcaria *tuberculata, Stackh. Boscastle, Padstow, Looe, Fowey, Falmouth, Lizard, St. Ives, Penzance Himanthalia lorea, Lyngb. Looe, Fowey, Padstow, Lizard Cystoseira *ericoides, C. Ag. Whitsand Bay, Looe, Padstow, Falmouth, Pen- zance stow, Falmouth, Penzance fibrosa, C. Ag. Looe, Padstow, Fal- mouth, Penzance TILOPTERIDACE./E Tilopteris Mertensii, Ktltz. Mount Edg- cumbe, Falmouth, Penzance Akinetospora *pusilla, Born. Cawsand, Boscastle, Newquay, Penzance, Land's End DICTYOTACE./E Dictyota dichotoma, Lam., var. implexa, J. Ag. Padstow, Falmouth var. latifrons, Holm. & Batt. Fal- mouth, Penzance, Scilly Isles Taonia *atomaria, J. Ag. Padstow, Pen- zance Padina *pavonia, Gaill. Boscastle Dictyopteris *polypodioides, Lamx. St. Austell Bay RHODOPHYCE^: PORPHYRACE.S: Goniotrichum *elegans, Le Jol. Padstow Erythropeltis *discigera, Sch., var. Flustrae, Batt. Scilly Isles Erythrotrichia carnea, J. Ag. Looe, Fowey, Falmouth, Penzance Scilly Isles Bangia fusco-purpurea, Lyngh., var. crispa, Holm. & Batt. Padstow Porphyra leucosticta, Thur. Mount Edg- cumbe, Falmouth, Scilly Isles linearis, Grev. Pridmouth, Falmouth, Penzance HELMINTHOCLADIACEJE Acrochaetium microscopicum, Nag. Kyn- ance, Penzance 86
 * plumula, Zan. Pridmouth, Falmouth
 * sphaerophorus, Sauv. Scilly Isles
 * tomentosa, Lyngb. Boscastle
 * granulata, C. Ag. Looe, Fowey, Pad-
 * discors, C. Ag. Padstow, Falmouth
 * ciliaris, Batt. Scilly Isles
 * Bertholdi, Batt. Falmouth, Helford,
 * ceramicola, Ralfs. Falmouth, Penzance
 * Boryana, Berth. Scilly Isles
 * lutea, J. Ag. Marazion (B.M.)