By clicking the link below you can download the index to the Icones Pleurothallidinarum (Vols. 1-30).
To open the pdf-file you'll need Acrobat Reader.
In Volume 24 (Stelis) a complete index is missing. You can download an index here.
In Volume 26 (Stelis) a complete index to more than half of the volume is missing. You can download an index for that part here.
These pages are designed for the Stylus font.