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File:EB1911 Palaeobotany - Palaeozoic fructifications of Ferns or Pteridosperms.jpg

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Description
English: Group of Palaeozoic fructifications of ferns or pteridosperms (see legend below).
Date published 1911
Source “Palaeobotany,” Encyclopædia Britannica (11th ed.), v. 20, 1911, p. 532, fig. 15.
Author After various authors in Scott, Studies.
Permission
(Reusing this file)
Public domain This image comes from the 13th 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.
English: Legend
:

A, Asterotheca. 1, Pinnule bearing 8 synangia. 2, Synangium in side view. 3, In section, magnified.

B, Renaultia. 1, Fertile pinnule, nat. size. 2, Sporangium, enlarged.

C, Dactylotheca, as in B.

D, Sturiella. Section of pinnule and synangium. a, Vascular bundle; c, hairs; b, d, annulus, magnified.

E, Oligocarpia. Sorus in surface-view, magnified.

F, Crossotheca. Fertile pinnule, bearing several tufts of microsporangia, magnified.

G, Senftenbergia. Group of annulate sporangia, magnified.

H, Hawlea. Synangium after dehiscence, magnified.

J, Urnatopteris. 1, Part of fertile pinna, nat. size. 2, Sporangia, showing apical pores, magnified.

Of the above. A, D, E, G and H, probably belong to true Ferns; F is the male fructification of a Pteridosperm (Lyginodendron); the rest are of doubtful nature.

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current16:31, 13 September 2017Thumbnail for version as of 16:31, 13 September 2017698 × 991 (344 KB)Bob BurkhardtRemove box glitch in upper right
16:23, 13 September 2017Thumbnail for version as of 16:23, 13 September 2017698 × 991 (344 KB)Bob Burkhardt{{Information |Description ={{en|1=Group of Palaeozoic fructifications of ferns or pteridosperms (see legend below).}} |Source =“Palaeobotany,” Encyclopædia Britannica (11th ed.), v. 20, 1911, p. 532, fig. 15. |Author =After var...

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