20 THE MARINE ALGAE OF ESSEX.
Ceramiaceae.
SPERMOTHAMNION, Aresch.
Spermothamnion turneri, Aresch., "Phyc. Scand.," p. 113.
Var variabile, J. Ag., "Spec. Algar," ii., p. 24. On the stems of
Furcellaria fastigiata, Lamour. Clacton, E. A. B. There are some
loose specimens of this species in Mr. Hope's collection, but no
locality is mentioned.
GRIFFITHSIA, Ag.
Griffithsia setacea, Ag., "Syn. Algar. Scand.," p. xxviii.
Walton, 1867, E. G. Varenne; Felixstowe and Harwich, G. P.
Hope, E. M. Holmes, and G. Massee; Clacton, E. A. B. This
species is very abundant at Felixstowe in some seasons. In June,
1893, Mr. Massee informs me, it was "by far the most abundant
weed on the coast."
G. Corallina, Ag., "Syn.," p. 28. Dovercourt, August, 1882,
T. H. Buffham.
HALURUS, Kutz,
Halurus equisetifolius, Kutz., "Phycol. General.," p. 374.
Felixstowe and Harwich, G. P. Hope.
PLEONOSPORIUM, Nag.
Pleonosporium borreri, Nag., "Sitzungsb. d. k. bayer. Akad.
d. Wissensch. zu Mijnschen," 1861, p. 342. Felixstowe Pier (young
plants), G. P. Hope.
RHODOCHORTON, Nag.
Rhodochorton rothii, Nag., "Sitzungsb. d. k. bayer. Akad.
d. Wissensch. zu Munschen," 1861, ii., p. 358. Dovercourt Pier,
"forming a carpet on the steps below low-water mark," G. P. Hope :
Clacton, E. A. B.
R. floridulum, Nag., "Sitzungsber. d. k. bayer. Akad, d.
Wissensch. zu Munschen," 1861, ii., p. 358. "Below low-water mark,
forming carpet to stone steps of Dovercourt Breakwater, June,
1883," G. P. Hope.
CALLITHAMNION, Lyngb.
Callithamnion polyspermum, Ag., "Spec. Alg.," ii., p. 169.
Harwich, July, 1882, G. P. Hope.
C. roseum, Ag., "Spec. Alg.," ii., p. 164. Southend, July, 1890,
Mrs. T. H. Buffham.