Blue green alga, Gloeotrichia

Blue green alga, Gloeotrichia

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Caption: Light micrograph of colonies of the filamentous "blue-green" alga, Gloeotrichia echinulata. Blue- green algae are also called cyanobacteria because of their close relationship in certain features to bacteria. Here, at centre, a filamentous colony is seen. It contains numerous radiating filaments each composed of many individual cells; each fila- ment terminates in a colourless hair. The base of the filaments are pigmented (red). Although cyano- bacteria are usually blue-green in colour, shades of pink to red (as here) occur due to carotenoid and other red cell pigments. Blue-green algae are primitive in structure, occurring in water, soil, & symbiotically. Magnification: x63 at 35mm size.

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Keywords: alga, algae, algal, blue-green, blue-green algae, botany, colonial, cyanobacteria, gloeotrichia echinulata, light micrograph, nature, plant

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