To which division of cryptogams do algae belong?

Algae belong to the division of cryptogams known as Thallophyta. Thallophyta comprises the most primitive group of plants that do not have differentiated plant bodies and lack true roots, stems, leaves, or vascular tissues. Algae are aquatic organisms, mostly photosynthetic, found in both fresh and marine water environments. They possess simple plant structures, often consisting of a thallus (a single-celled or multicellular body), and reproduce primarily through asexual means like cell division or spore production. Some algae, like kelp and seaweed, can grow into large and complex structures. Thallophyta also includes other groups such as fungi, lichens, and slime molds.