Abstract

<jats:title>Summary</jats:title><jats:p>1. The morphology and anatomy of <jats:italic>Trichomanes aphlebioides</jats:italic> Christ, a species endemic to New Guinea, is shortly described.</jats:p><jats:p>2. The most outstanding feature of the species is the presence of aphlebioid leaves. These latter are shown to be the modified first fronds of the axillary branches.</jats:p><jats:p>3. The anatomy of the alphebioid leaves is described. They show great reduction in relation to the humid conditions of the high forests in which the plant grows.</jats:p><jats:p>4. The morphology of aphlebiæ and aphlebioid leaves is briefly discussed.</jats:p><jats:p>5. No experimental evidence is available with regard to the function of the aphlebioid leaves. Mention is made, however, of the various suggestions which have been put forward in relation to this question.</jats:p>