Fig. 26.30 Root nodules induced by Frankia alni on black alder. Frankia alni is a actinobacterial
species that induces the formation of root nodules on black alder (Alnus glutinosa) trees, also called
the common alder. These nodules can become visible above ground if the trees roots become
exposed. The genus Frankia is named in honor of Albert Bernhard Frank. The upper image is titled
“Alder nodules2.JPG” by author Cwmhiraeth and it is being used under a Creative Commons
Attribution-Share Alike 3.0 Unported license. The lower image is titled “Frankia alni.jpg” by author
Lebrac and it is being used under a Creative Commons Attribution-Share Alike 1.0 generic license.
The authors description which accompanied the lower image is “Frankia alni, Aktinorrhiza,
Wurzelknöllchen an Schwarzerle” which translates into English as [Frankia alni, actinorrhiza,
root nodules on black alder]
580
C. J. Hurst
species that induces the formation of root nodules on black alder (Alnus glutinosa) trees, also called
the common alder. These nodules can become visible above ground if the trees roots become
exposed. The genus Frankia is named in honor of Albert Bernhard Frank. The upper image is titled
“Alder nodules2.JPG” by author Cwmhiraeth and it is being used under a Creative Commons
Attribution-Share Alike 3.0 Unported license. The lower image is titled “Frankia alni.jpg” by author
Lebrac and it is being used under a Creative Commons Attribution-Share Alike 1.0 generic license.
The authors description which accompanied the lower image is “Frankia alni, Aktinorrhiza,
Wurzelknöllchen an Schwarzerle” which translates into English as [Frankia alni, actinorrhiza,
root nodules on black alder]
580
C. J. Hurst