Four species of the genus Predaea from tropical and warm-temperature regions of eastern and western Australia are treated. P. incraspeda sp. nov., P. huismanii, sp. nov. and P. laciniosa sp. nov. are described. P. weldii Kraft et Abbott, is recorded for the 1st time outside its Hawaiian type locality. P. incraspeda, from Lord Howe I., New South Wales, and P. huismanii, from Rottnest I., Western Australia, are unique within the genus in displaying "shaggy" outer cortices of exserted fascicles of unevenly long cortical filaments and in producing nutritive filaments on cells other than those immediately contiguous to the auxiliary cells. P. laciniosa, from the Great Barrier Reef, is one of the few Predaea spp. with compact submoniliform cortical filaments in which conspicuous intercalary gland cells occur. P. weldii apparently is widespread down the Australian east coast to the vicinity of 31.degree. south latitude. The earlier claim by Kraft and Abbott that P. weldii encompasses 2 distinct forms of greatly differing anatomical composition is repudiated on the evidence of extensive recent collections. Justification for the recently proposed genus Predaeopsis by Kajimura is questioned, and his anticipated transfer of P. weldii to Predaeopsis is rejected.