Technical Abstract: A sooty mold disease on longan (Dimocarpus longan L.) was found on trees growing close to bodies of water in Puerto Rico. On the basis of the morphological characters the fungi associated with this disease were identified as Tripospermum porosporiferum Matsushima and T. variabile Matsushima. T. porosporiferum produced hyaline to pale brown tri or tetraradiate conidia. Conidia (40 x 6.6 µm) have four septate appendages, with a shorter two-celled axis 16 µm long. Conidia are constricted at septa. T. variabile produced pale brown, triradiate (T-shape) conidia (36 x 6.6 µm) with main axis not bent back. Conidia are constricted at septa and the shorter part of axis which is 6.39 µm long. Both organisms have been reported in Puerto Rico in decaying vegetation in bodies of water. Studies will be initiated to assess the impact of these fungi on production of trees cultivated near bodies of water where these fungi are most commonly found.