142 
NEW BRITISH MARINE ALGJE. 
* Cladostephus plumosus, Holmes Cladostephus distichus, Holmes 
MSS. {Traill in Algceof Firth of Forth Proc. Royal Pl/ys.Soc. Fdinb., 1882). 
Sphacelaria plumosa, Lyngb. Hydr. p. 100, t. 3 0,fig. c. 
Ardrossan and Portincross, Rev. D. Landsborough. Anglesea, 
J. E. Griffiths. Kinghorn, G. W. Traill. Killbride, Ayrshire, 
sub S. plumosa in Herb. Brit. Mus. 
Stilophora Lejolisii, Thur. in Alg. Mar. de Cherb.,pr. 8-9. 
Looe, Cornwall, R. V. Tellam. Brighton, Mrs. Merrifield. 
Arran, Herb. Gray. 
ALGAE BRITANNICAE RARIORES EXSICCATAE. 
Fasc. I. 
By E. M. Holmes. 
Of the twenty-five species contained in the first fasciculus, 
twenty are new to Britain since Harvey’s Phycologia Britannica 
was published, and the other five are rarely met with in herbaria. 
No. 6, D. Mesogloia , has probably been mistaken in the North of 
England and Scotland, for Mesogloia virescens, from which it is only 
distinguishable when seen growing by the acute apices of the 
fronds. Nos. 19 and 20, Phloespora subarticulata and P. tortilis have 
undoubtedly passed unnoticed in collections under the name of 
Dictyosiphon foeniculaceus. The fruits of Sphacelaria plumigera 
(23), and of Cladostephus plumosus (1), have only recently been 
described, and the two plants so closely resemble each other in the 
sterile state that only a careful examination of a series of speci- 
mens, or a microscopic section of the frond, would render it easy 
to separate them. 
1. Cladostephus plumosus, Holmes. (Sphacelaria plumosa, 
Lyngb.) 
Ardrossan, August, 1882, Rev. H. Landsborough. 
2. Corallina Mediterranea, Aresch. 
The Lizard, July, 1882, E. M. Holmes. 
3. Cordylecladia erecta, J. Ag. {Tetraspores). 
Folkestone, November, 1881, E. M. Holmes. 
4. Dictyosiphon foeniculaceus, Grev. subsp., hispidus, Kjellm. 
Joppa, near Edinburgh, June, 1881, G. W. Traill. 
5. Dictyosiphon hippuroides, Aresch. 
Dunbar, June, 1881, G. W. Traill. 
6. Dictyosiphon Mesogloia, Aresch. 
Longniddry, July, 1881, G. W. Traill. 
