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![A large pond full of algae in southeastern US](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1641715114822-A3FMEJAU95BWLJPKWJZ5/IMG_7828.jpeg)
![A bluish green clump of red algae in the genus Batrachospermum](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1641715119615-UVWXHNMFSHUJU18GE4ZA/IMG_9849.jpeg)
![Batrachospermum with axial and pericentral cells at 100x](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1641715112599-B26G4F7B12TC1QPGLCHN/IMG_9882.jpeg)
![Batrachospermum apical cell at the top giving rise to axial cells in the center which grow outwards into branches at 100x](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1641715116341-8AWDX1FFTDW54PPE4CZA/IMG_9885.jpeg)
![Batrachospermum with the pigment phycocyanin that gives it a bluish green color at 100x](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1641715117439-YOFU4C01E9D0SDEFQMF4/IMG_9880.jpeg)
![Batrachospermum whorls of branches at 400x](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1641715120865-0LQ1MWJPZZM0VJADS13Q/IMG_9877.jpeg)
![Batrachospermum filaments at 400x](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1641715122222-STAQYGNUIQ47JU94EXPO/IMG_9879.jpeg)
![Epiphytic red algae in the genus Audouinella inside a freshwater aquarium](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1642894241744-KVSHNB1G9NU8XNUGE1BZ/IMG_4965.jpeg)
![Audouinella, also known as black algae at 100x](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1642894240531-JD7X1LN2KV3YSZ0A94TQ/IMG_4985.jpeg)
![Audouinella with phycocyanin pigments at 400x](https://images.squarespace-cdn.com/content/v1/57b4355cbe65942bdfc8d605/1642894242627-VGWYRXT3K2IGQVPH9SNX/IMG_4987.jpeg)