International Scientific Vocabulary
1904, in the meaning defined above
pteridophytic
pteridosperm
Pteridospermae
“Pteridosperm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pteridosperm. Accessed 22 Dec. 2024.
Britannica.com: Encyclopedia article about pteridosperm
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