File:EB1911 Pteridophyta - Polypodium vulgare - antheridia and spermatozoids.jpg

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Description

English: Polypodium vulgare: A, Mature antheridium. B, Empty antheridium; p, prothallial cell; 1, 2, cells of antheridial walls; 3, cap cell. C, D, Spermatozoids.

Date

published 1911

Source

Encyclopædia Britannica (11th ed.), v. 22, 1911, “Pteridophyta,” fig. 8, p. 611.

Author

From Strasburger's Lehrbuch der Botanik

Permission
(Reusing this file)

This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

The captions for A and B seem confused.

File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	15:27, 5 June 2017		403 × 422 (48 KB)	Bob Burkhardt	{{Information \|Description ={{en\|1=''Polypodium vulgare'': ''A'', Mature antheridium. ''B'', Empty antheridium; ''p'', prothallial cell; 1, 2, cells of antheridial walls; 3, cap cell. ''C'', ''D'', Spermatozoids.}} \|Source =''Encyclopædia...

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