Flowerless plants are termed as Cryptogams. These plants have thallus body structure such as algae, lichens and bryophytes except pteridophytes. these are vascular non-flowerng plant. The best-known groups of cryptogams are algae, lichens, mosses, and ferns, but it also includes non-photosynthetic organisms traditionally classified as plants, such as fungi, slime molds, and bacteria. The classification is now deprecated in Linnaean taxonomy.
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