NEW BRITISH MARINE ALG2E. 
141 
* P. tortilis, Aresch. Bot, Not. 1876, p. 34; Kjellm.on Spets. Thall. II ,,t. 1, 
f. 21. 
Cullercoats, Miss E. Bainbridge. Joppa, G. W. Traill. Kil- 
donan, Herb, Landsborough, Berwick-on-Tweed, E. Batters. 
Filey, 1868, C. Stevens, in Herbarium Gray. 
* Streblonema investiens, Thur. 
Parasitical on Gracilaria compressa. Weymouth, E. M. 
Holmes. 
* S. reptans, Cm. 
Parasitical on Cladophora. Trebarwitb, Cornwall, Miss A. 
Cresswell. On Chcetomorphcerea, Weymouth, Miss K. Appleford. 
On Cladophora Icetevirens, Sidmouth, E. M. Holmes. 
* Ectocarpus simplex, Cm. Flor. du Finist. p. 163; Desm. Exs. 1806. 
On Codium tomentosum. Lizard, E. M. Holmes. 
* E. insignis, Cm. Flor . du Finist. p. 163; Alg. Mar. Finist. exs. 14. 
On Zostera roots. Smallmouth, near Weymouth, E. M. 
Holmes. 
E. elegans, Thur. Alg. Mar. de Cherb.p. 77, pi. u.,fig. 1-2. 
On Desmarestia aculeata. Falmouth, F. W. Smith. 
E. ramellosus, Ktz. Phyc. germ. p. 235. 
Padstow, R. Y. Tellam. 
E. terminalis, Kutz. Phyc. germ.p. 236; tab. phyc. v., t. 74,, f. 2. 
On Chcetomorpha cerea. Smallmouth, near Weymouth, Miss K. 
Appleford. On Corallina. Fowey, R. Y. Tellam. 
* Giraudia sphacelarioides, Derb. et Sol. in Cast. Cat. pi. Mars, suppl. 
p. 101 ; Phys. des Algee. pi. xiv„ f. 12-16 ; Aresch. Obs. Phyc. in., fig. 1. 
On decaying Zostera leaves. Smallmouth, near Weymouth, E. 
M. Holmes. 
* Sphacelaria plumigera, Holmes. 
Eastbourne, W. Borrer. Joppa, G. W. Traill. Carnarvon, J. 
E. Griffiths. Cullercoats, Miss E. Bainbridge. Folkestone, E. 
M. Holmes. Herne Bay, Torquay, Herbarium Gray. 
This plant has long passed as Lyngbye’s Sphacelaria plumosa , 
but is really a Cladostephus, since it has fruit on minute special 
branches on the main axis, as in that genus, with which also it 
agrees in stem structure. I have therefore named it Cladostephus 
plumosus. S. plumigera is a true Sphacelaria , with sporangia only 
on the ultimate ramuli. Borrer’s specimen, found at Eastbourne in 
1808, and now in the Herbarium of the British Museum, has uni- 
locular sporangia. 
* S. scoparioides, Lyngb. Hydr. p. 107, t. 32. fig. c. 
Bognor, 1831, Mrs. Gray, in Herb. Brit. Mus. Brighton, 
1859, Mrs. Merrifield. 
* S. pseudoplumosa, Cr. Flor. du Finist. p. 164, pi. xx\.,Jig. 161. 
Ilfracombe. Mixed with S. sertularia, and so named in Herb. 
Griffiths, in Linn. Soc. Brighton, Mrs. Merrifield, 1859. Small- 
mouth, near Weymouth, E. M. Holmes. 
* Sp. caespitula, Lyngb. Hydr.p. 105, t. 32, Jig. a. 
Berwick-on-Tweed, E. Batters. 
