This volume contains two sections, plus an addenda with miscellaneous new species and a corrigenda.
The genus Lepanthes in Bolivia:
Following a brief history and discussion of the genus Lepanthes Sw. in Bolivia, the 67 currently known species are described and illustrated with black and white line drawings.
Systematics of Octomeria:
A brief history of Octomeria R.Br, is given. The genus is divided into two groups, those species north and west of Brazil, treated herein with a key, descriptions and illustrations, and those species of Brazil and southern neighbors to be treated in a subsequent Icones Pleurothallidinarum.