Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

On the stomata of Salvinia herzogii (Salviniaceae, Pteridophyta)

E. R. de la Sota and Liliana A. Cassa de Pazos
Plant Systematics and Evolution
Vol. 172, No. 1/4 (1990), pp. 119-125
Published by: Springer
Stable URL: http://www.jstor.org/stable/23674703
Page Count: 7
  • More info
  • Cite this Item
On the stomata of Salvinia herzogii (Salviniaceae, Pteridophyta)
Preview not available

Abstract

The structure of the stomata of the floating leaves of Salvinia herzogii has been analyzed with light and scanning electron microscopy. Peculiar extensions (cuticle?) of the outer and inner tangential sides of the walls of the guard-cells are described. Both extensions, partially joined at their ends, are encircling a pore. This structure is used to propose an alternative explanation for the risk of the occlusion of the ostioles, different from that given by Haberlandt. The conductivity of these stomata was checked with a porometer and the ostioles proved to be permanently open. Their type of stomatogenesis is discussed. The stomata of Salvinia are considered to be vestigial structures and their sunken position is taken as evidence in support of a xeric hypothetic ancestor of the genus.

Page Thumbnails

  • Thumbnail: Page 
[119]
    [119]
  • Thumbnail: Page 
120
    120
  • Thumbnail: Page 
121
    121
  • Thumbnail: Page 
122
    122
  • Thumbnail: Page 
123
    123
  • Thumbnail: Page 
124
    124
  • Thumbnail: Page 
125
    125