. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ndthat such names as diatomin are to a greatextent meaningless. Kohl (06) has shown thatthe pigment in the chromatophores of diatomsconsists of chlorophyll, carotin and (05) asserts that leucocyanin alsooccurs in the chromatophores of diatoms, andthat it is this pigment which causes theseplants (and also an alcoholic solution of diatomin) to turn blue-green on the ad-dition of hydrochloric or sulphuric acid. Pyrenoids are
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ndthat such names as diatomin are to a greatextent meaningless. Kohl (06) has shown thatthe pigment in the chromatophores of diatomsconsists of chlorophyll, carotin and (05) asserts that leucocyanin alsooccurs in the chromatophores of diatoms, andthat it is this pigment which causes theseplants (and also an alcoholic solution of diatomin) to turn blue-green on the ad-dition of hydrochloric or sulphuric acid. Pyrenoids are found in the chromatophoresof diatoms, but they are variable both innumber and disposition. They consist of analbuminous protein and are usually infrequently they are grouped in clusters,and they often project internally from thechromatophores, Mereschowsky (03) havingrecorded instances in which they have partiallyor entirely emerged from the chromatophores,appearing as free, colourless bodies on theirinner surfaces. In most diatom cells there are drops of afatty oil which are generally more conspicuous than the pyrenoids. This oil. Fig. 69. A, Girdle view of Nitz-schia siymoidea (Ehrenb.) W. two large chromato-phores with oil globules, andalso the nucleus. B and C,Valve views of Cyclotella compta(Ehrenb.) Kiitz. showing nume-rous discoidal chromatophores. D, Isolated perforated chromato-phore of Gyrosigma balticum(Ehrenb.) (after O. Miiller). E, Girdle view of Synedra Ulna(Nitzsch) Ehrenb. showing theirregular chromatophores. ch,chromatophores ; n, nucleus ;ol, oil globules. Colony formation 97
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