Eighteen foliicolous species of Porina and (Trichotheliaceae) are reported for the first time from the Solomon Islands and/or Vanuatu in the south-western Pacific Ocean. McCarthy (2000) reported seven corticolous species of Porina collected in Vanuatu by H, Streimann and P, Ala. Subsequently, Lucking et al, (2001) described the foliicolous P. vanuatuensis from Espmtu Santo, and provided the first reports of P. cerina, P. conica, P. mirabilis, P. virescens and Trichothelium alboatrum from Vanuatu. McCarthy (2002) documented six corticolous and saxicolous Porina species collected by D.J. Hill on the 1965 Royal Society expedition to the Solomon Islands. This paper is based on additional Hill collections from the Solomon Islands (in BM) and Streimann and Ala specimens from Vanuatu (in CANB). It brings the number of Trichotheliaceae known from all substrata in the Solomon Islands to 19, with 21 known from Vanuatu. The combined diversity in the two island groups is 30 taxa; 22 of these also occur in Australia, 18 in Papua New Guinea, and 13 in New Caledonia, and 10 are common to both. Particularly noteworthy records reported here include a marked extension of the range ofP. suhapplanata northward from temperate Australia and New Zealand, the first collections of P. canthicarpa and P. tolgensis outside north-eastern Queensland, and further collections of the recently described P. vanuatuensis from Vanuatu and the Solomon Islands.