@misc{indiciaec53f52a8a8d5,
  title = {Pollen and spore morphology/plant taxonomy; gymnospermae, pteriodophyta, bryophyta (Illustrations) — Illustration, BHL page 4725321},
  year = {1957},
  url = {https://www.biodiversitylibrary.org/page/4725321},
  note = {Source identifier: page-4725321}
}