Western Australia has relatively few species of moss; the most recent census found just 192 taxa. This represents just 10% of Australia's total moss flora, even though Western Australia accounts for about one third of the Australia by area. This relatively low diversity has been attributed to the lack of rainforest in the state. By far the majority of the state's moss species occur in the Southwest Botanical Province, with over 80% of all species, genera and families occurring there. This includes four species that are apparently endemic to the province.