Chapter 21

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Across
  1. 2. Coiled young fern leaf
  2. 5. Protective covering over fern sori
  3. 7. Structure that bears microspores
  4. 9. Preserved remains or traces of ancient organisms
  5. 11. Division of plants known as club mosses
  6. 12. Fossil formed when minerals replace organic material
  7. 13. Genus of spikemoss with micro and megaspores
  8. 17. Structure that bears megaspores
Down
  1. 1. Division of plants known as whisk ferns
  2. 3. Small leaflike structure lacking vascular tissue
  3. 4. Fossilized animal feces
  4. 6. Cone like structure that bears reproductive organs
  5. 8. Division of plants known as ferns
  6. 10. Division of plants known as horsetails
  7. 14. Ring of cells that aids in spore release in ferns
  8. 15. Early vascular plant genus from the fossil record
  9. 16. Extinct early vascular plant with lateral sporangia