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| male reproductive structure which produces gametes in ferns, mosses, fungi and algae |
| plants without a xylem and phloem to transport fluid and nutrients internally |
| disk flower
Any of the tiny tubular flowers in the central portion of the capitulum or flower head of certain plants of the composite family (Asteraceae or Compositae). In many composite flowers, such as the daisy and sunflower, the disk flowers are surrounded by flattened ray flowers. |