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Lower plants
The 'lower plants' comprise everything from tiny microscopic algae to seaweeds, mosses and ferns. Traditionally, they also include fungi and a strange group called slime moulds (neither of which are closely related to true plants but are both studied and collected by botanists). Some of the most bizarre types of plant are encountered in these groups.
Image: Adder's-tongue fern (Ophioglossum) and moonwort (Botrychium)