In 1979 a combined Indonesian-Dutch expedition, sponsored by WOTRO, was held in Sulawesi, Indonesia. In addition to herbarium material, a large number of living orchids was collected. The living plants were distributed to the Kebun Raya, Bogor, the Hortus Botanicus, Leiden, and the Hortus Botanicus, G.U., Amsterdam. Among the specimens which flowered in Leiden, two different species appeared to belong to the genus Bracisepalum. This genus was hitherto only known from the type collection of B. selebicum. Additional herbarium material of this species was collected by Van Balgooy in the field. This article is the first in a series of treatments for Flora Malesiana of genera belonging to the subtribe Coelogyninae, by the first author. The next revision will cover Pholidota and related genera. Mr. J. Vermeulen is responsible for the scientifically very accurate and beautiful drawings.