THE MARINE ALGAE OF ESSEX. 5
Trindelen," etc., p. 17, tab. vii., fig. 4. Oh the muddy banks of the
Stour, near Harwich; June, 1885, E. A. B. 
OSCILLATORIA, Vaucher.
Oscillatoria corallinae, Gom., in Morot, "Journ. Bot.," iv.,
p. 356. On the muddy banks of the Stour, near Harwich; June,
1885, E. A. B. 
LYNGBYA, C, Ag.
Lyngbya semi-plena, J. Ag., "Alg. Mar. Med.," p. 11. On
rocks and posts near high-water mark. Southend, July, 1890, Mrs.
Buffham. 
L. aestuarii, Liebman, "Bemerkninger og Tillag til den
danske Algeflora," Kroger's "Tidskrift," 1841, p. 492. On the
muddy banks of the Stour and Orwell; June, 1885, E. A. B. Not
uncommon.
SYMPLOCA, Kutz.
Symploca hydnoides, Kutz., "Spec. Algar.," p. 272. Rocks at
and above high-water mark. Felixstowe, June, 1885, E. A. B. This
species is also found on the muddy banks of the Stour and Orwell.
Vaginarieae, Gomont.
MICROCOLEUS, Desmaz.
Microcoleus chthonoplastes, Thur., "Ess. de Classif. des
Nostoc. Ann. des Sc. nat., 6 ser., Bot.," i., p. 378. On the muddy
banks of the Stour, and in the shallow pools of the salt marsh
between Felixstowe Railway-station and the River.
HETEROCYSTEAE, Hansg.
Rivulariaceae, Rabenh.
CALOTHRIX, Ag.
Calothrix scopulorum, Ag., "Syst. Alg.," p. 70. On posts
near high-water mark. Clacton, Jan., 1893, E. A. B. This species
is usually found growing in company with species of Enteromorpha,
Chaetomorphae, and other small algae.
C. pulvinata, Ag., "Syst. Alg.," p. 71. "On stakes near the
shore, Osey Island," E.M.Holmes, Essex Naturalist, vol. ii.,
p. 249.
C. confervicola, Ag., "Syst. Alg.," p. 70. Epiphytic on
various small algae, specially Ceramium rubrum. Although this
species has not been recorded from the county of Essex, it is almost