a red Blue-Green alga

Images made through a microscope. All subject types.

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Franz Neidl
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Location: Italy

a red Blue-Green alga

Post by Franz Neidl »

I found in marine plancton this red blue-green alga (Bacteriophyceae). The filaments were 5 µm thick. I think this is an Oscillatoria, but I am not shure. Somebody can help me?
Two pictures with obj. 40X, DIC




Charles Krebs
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Location: Issaquah, WA USA

Post by Charles Krebs »

I like the second image a great deal.

Can't really help with the ID, but I don't see a distinct mucilage "sheath", which would rule out some other similar looking cyanobacteria.

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Post by fpelectronica »

Hello Franz

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Post by Mitch640 »

Great images Franz. Do you know what the red comes from? Very neat looking twisted algae in #1.

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red color

Post by uaalgae »

Blue-green algae have two special water-soluble pigments - phycocyanin and phycoerythrin. The first pigment combined with chlorophyll a gives the algae a blue color. Under stress, the blue-green may express more phycoerythrin which will turn the alga red. Red algae have a lot of phycoerythrin and is therefore very red.

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