Icones Pleurothallidinarum 18 contains section Pleurothallis subsections Antenniferae, Longiracemosae, and Macrophyllae, and subgenera Pseudostelis and Acuminatia on 182 pages with 172 line drawings, and with the addenda occupying about one-fourth the volume of the book. The species treated are characterized by a usually many-flowered, racemose inflorescence, which is reduced to a single flower in a few species. Many of the species are frequently cultivated.