A CATALOGUE OF THE BKITISH MARINE ALG^E 29 



Seainill). Creeping between the cortical filaments of Mesogloia 

 vermiculata. Probably not uncommon. 



8. volubile Thur. Coasts of Devon (Torquay, Wembury, Teign- 

 mouth, Sidrnouth) and Dorset (Swanage, Studland). Very rare. 

 Creeping between the cortical filaments of Dudresnaya verticillata. 



S. tenuissimuni Hauck. Coasts of Devon (Meadfoot, Torquay) 

 and Dorset (Swanage). Wales (Anglesea, Llangwyfan). Creeping 

 between the cortical filaments of Mesoyloia Griffithsiana. Rare. 



S. intestinum Holm. & Batt. (= Entonema intestinum Reinsch). 

 Coast of Dorset (Weymouth). Immersed in the cortical layers of 

 Brongniartella byssoides. Very rare. 



S. fascicnlatum Thur. Coasts of Dorset (Weymouth) and North- 

 umberland (Berwick). Wales: Anglesea (Llangwyfan). Scotland: 

 Berwicks. (Burnmouth) ; Bute (Isles of Cumbrae and Bute). Chan- 

 nel Islands (Alderney). Immersed amongst the cortical filaments 

 of Castaynea virescens. /3 simplex Batt. Coasts of Dorset (Swanage) 

 and Bute (Isle of Cumbrae). Immersed between the cortical fila- 

 ments of Helminthora divaricata and Castagnea virescens. Rare. 



S. infest ians Batt. (= Endodictyon infestians Gran.). Coast of 

 Hants (Southsea). Endozoic in species of Alcyomdiiiui. Rare. 



S. cBquale Oltrn. Coasts of Devon (Teignmouth) ; Dorset 

 (Swanage); Hants (Isle of Wight). Scotland: Bute (Isle of 

 Cumbrae). Immersed in the cortical layer of Chorda filum. Pro- 

 bably not uncommon. 



S. Zanardinii (= Ecto carp its Zanardinii Cm.). Coasts of Corn- 

 wall (Falmouth) ; Devon (Torquay) ; Dorset (Swanage, Weymouth) ; 

 Hants (Isle of Wight). Scotland : Bute (Isle of Cumbrae). Channel 

 Islands (Guernsey). Immersed in the cortical layer of Chylocladia 

 kaliformis. Probably not uncommon. 



S. ? helophorus ( Ectocarpus helophorus Rosen v.). Coasts of 

 Northumberland (Berwick) and Bute (Isle of Cumbrae). Immersed 

 in the fronds of Petrocelis cruenta. Rare. 



Gen. 88. ECTOCARPUS Lyngb. 

 1. Parasitic Species. 



E. parasiticus Sauv. Coasts of Dorset (Weymouth, Swanage), 

 Sussex (Worthing), Northumberland (Berwick), and Bute (Isle of 

 Cumbrae). Parasitic in the thallus of Ceramium rubrum and 

 Cystocloniiim purpurascens. Probably not uncommon. 



E. Stilophora Cm. Coasts of Cornwall (Falmouth) and Dorset 

 (Weymouth, Swanage). Parasitic in the fronds of Stilophora rhi- 

 zodes. Rare. ft ccespitosa Rosenv. Coast of Dorset (Weymouth, 

 Swanage). Rare. y cervicornis Batt. Coast of Cornwall (Fal- 

 mouth). Very rare. 



E. clandestine Sauv. (= Elachista clandestina Cm.). Coasts of 

 Devon (Sidmouthj and Northumberland. Parasitic in the thallus 

 of various species of Fitci. Very rare. 



E. brevis Sauv. Coast of Northumberland (Berwick). Parasitic 

 in the thallus of Ascophyllum nodosum. Rare. 



E. Valiantei Born, in Journ. de Botanique, vi. 1892. Parasitic 

 in the thallus of Cystoseira ericoides. Cobo, Guernsey, July, 1900, 

 Mrs. A. Hamber. 



