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Microcystin-LA accounts for the protein phosphatase (types 1, 2A and 3) inhibitory activity of the terrestrial blue-green alga Hapalosiphon hibernicus BZ-3-1.

Scytophycin B, 6-hydroxyscytophycin B, scytophycin E, and 6-hydroxy-7-O-methylscytophycin E account for the cytotoxicity and fungicidal activity of the terrestrial blue-green algaCylindrospermum muscicola.

Nine halogenated acetic acids and nine halogenated acrylic acids have been identified in the aqueous extract of Hawaiian Asparagopsis taxiformis .

(−)-trans-7(S)-Methoxytetradec-4-enoic acid and the related amides, malyngamides A, B and C, were found as constituents of shallow-water varieties of the marine blue-green alga Lyngbya majuscule.

β-crenulal is a moniter constituent of the marine brown alga Dictyota crenulata from Hawaii and is identical with sanadaol isolated from Pachydictyon coriaceum in Japan

4(S*),6(S*),8(S*),10(S*),12(R*),14(R*),16(R*),18(R*),20(R*)-Nonamethoxy-1-pentacosene and smaller amounts of the isotactic homologs, 4,6,8,10,12,14,16,18,20,22-decamethoxy-1-heptacosene and 4,6,8,10,12,14,16,18-octamethoxy-1-tricosene, are novel lipophilic constituents of the toxic blue-green alga Tolypothrix conglutinata var. chlorata Ghose from Fanning Atoll.

Dechlorofontonamide, anhydrohapaloxindoles B and M, and hapalonamides G, H, and V have been isolated as minor indole alkaloids from a cultured strain of the terrestrial blue-green alga Hapalosiphon fontinalis .

4β-Hydroxydictyodial A and 18,O-dihydro-4β-hydroxydictyodial A 18-acetate are two minor aldehydic diterpenes in the brown alga Dictyota crenulata. 1H NMR and lanthanide-induced chemical shift studies indicate that the relative stereochemistry of both compounds is 2R*, 3R*, 4S*, 10S*.

(+)-α(S)-Butyramido-γ-butyrolactone is a minor constituent of the toxic marine blue-green alga Lyngbya majuscula .

Tubercidin, a biologically active pyrrolo[2,3-d]pyrimidine nucleoside previously isolated from Streptomyces tubercidicus , has been identified as a major metabolise of the cyanophyte Tolypothrix byssoidea .

A new fatty acid, 7-methoxy-9-methylhexadeca- 4(E),8(E)-dienoic acid, has been isolated from a toxic, deep-water variety of the marine blue-green alga Lyngbya majuscula.

(−)- E -1-Chlorotridec-1-ene-6,8-diol is a major constituent in a mixture of cyanophytes, tentatively identified as primarily Schizothrix calcicola and Oscillatoria nigroviridis , from Enewetak Atoll. The absolute configuration of the diol is probably 6 R ,8 R .

( S )-(−)-3,4-Dihydroxybutanoic acid γ-lactone, which has the opposite configuration of the lactone generated from hydrolysis of oscillatoxin A, is a metabolite of Puerto Rican Lyngbya majuscula .

A herbicidal component isolated from ethanolic extracts of Lyngbya aestuarii was identified as 2,5-dimethyldodecanoic acid. It inhibited the growth of Lemna minor at concentrations higher than 200 ng/ml. Growth inhibition was strongly pH dependent.

(+)-2( S )- N -Acetamido-3( R )-acetoxyoctadecan-1-ol, a diacetate of dihydrosphingosine, and fatty acid amides of (−)-2( S )-amino-3( R )-hydroxyoctadec-4( E )-en-1-ol (sphingosine) have been isolated from extracts of Hawaiian Laurencia nidifica and Amansia glomerata , respectively. Although well known as constituents of nerve tissue hydrolyzates throughout the animal kingdom, these compounds have not been previously found in plants.

(−)-3-Bromomethyl-3-chloro-7-methyl-1,6-octadiene, the proposed precursor of E- and Z-3-bromomethylene-3-methyl-1,6-octadienes from the essential oils of Hawaiian and Japanese Chondrococcus hornemanni , is the major halogenated monoterpene in the essential oil of Sri Lankan C. hornemanni . Unlike the essential oils of Hawaiian and Japanese (subtropical) C. hornemanni , the essential oil of Sri Lankan (tropical) C. hornemanni does not contain halogenated myrcenes.