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AlgaeÃÂ & x28;/ÃËÃÂ¦ldÃâi,ÃÂ ÃËÃÂ¦lÃÂ¡i/; singularÃÂ algaÃÂ /ÃËÃÂ¦lÃÂ¡Ãâ¢/& x29; is an informal term for a large, diverse group ofÃÂ photosyntheticÃÂ organismsÃÂ that are not necessarily closely related, and is thusÃÂ polyphyletic. Included organisms range fromÃÂ unicellularÃÂ microalgaeÃÂ genera, such asÃÂ ChlorellaÃÂ and theÃÂ diatoms, toÃÂ multicellularforms, such as theÃÂ giant kelp, a largeÃÂ brown algaÃÂ which may grow up to 50ÃÂ m in length. Most are aquatic andÃÂ autotrophicÃÂ and lack many of the distinct cell and tissue types, such asÃÂ stomata,ÃÂ xylem, andÃÂ phloem, which are found inÃÂ land plants. The largest and most complex marine algae are calledÃÂ seaweeds, while the most complex freshwater forms are theÃÂ Charophyta, aÃÂ divisionÃÂ of green algae which includes, for example,ÃÂ SpirogyraÃÂ and theÃÂ stoneworts.