Diverse floral remains were collected from a site near the Shackleton Glacier, Antarctica during the 1995-1996 austral field season. The locality includes small accumulations of permineralized peat, in situ trunks, and impression/compression fossils, all within a series of fluvial deposits. The compression flora is dominated by the corystosperm leaf type Dicroidium, but leaves assignable to Heidiphyllum are also present. Fossils occur in the upper Fremouw Formation or the overlying Falla Formation and are believed to be late Middle to early Late Triassic in age. A number of specimens of compressed reproductive organs were also discovered. Many of these correspond to the cupulate corystosperm taxon Umkomasia, but some exhibit a different morphology. At least one of the latter type is preserved still attached to a vegetative branch. This specimen consists of a main axis about 1.5 cm in diameter, bearing stout, alternately arranged lateral axes up to 3 cm long that look like short shoots. On the surface of the laterals are closely-spaced lenticular scars that appear to represent the former positions of leaves. Attached to the tip of some of these short shoots are elongate, slender axes, each terminated by a cupule-like structure. The cupule is flattened and appears to consist of several units that may represent either cupule lobes or seeds. The affinities of these reproductive organs will be discussed as they relate to the vegetative remains at the site, and to other Mesozoic cupulate organs.

Key words: Antarctica, cupules, ovulate, pteridosperm, reproductive, Triassic