In this study, we examined the impacts of a bushfire on a community of myxomycetes (also known as plasmodial slime moulds or myxogastrids) in northeastern New South Wales, Australia. Using the moist chamber culture technique, we prepared 40 moist chamber cultures from four different substrates. We collected the same four types of substrates on either side of a fire line approximately six months post-fire in order to assess what impact fire had on the myxomycete communities. Sixty percent of moist chamber cultures yielded evidence (plasmodia or fruiting bodies) of myxomycetes representing eleven species in eight genera. But only 40% of samples from the burned site were positive for myxomycetes, and only one species produced fruiting bodies. In contrast, 80% of samples from the unburned site were positive, and all eleven species were recorded. These data suggest that fire reduced the abundance and diversity of the myxomycete community at our site.

Little is known about species of myxomycetes associated with vertebrate dung in Australia. In the present study, dung samples of 15 species of mammals (eight marsupials, three native rodents and four domestic or feral eutherians) and a large flightless bird (the southern cassowary, Casuarius casuarius) were collected and processed in 84 moist chamber cultures. Fifty-two percent of these cultures yielded evidence (fruiting bodies and/or plasmodia) of myxomycetes. Eleven species belonging to seven genera were recorded. Licea tenera was the most common species in the study (recorded from 12 moist chamber cultures) and is also a new record for the continent. Perichaena depressa, Didymium difforme and Cribraria violacea were the only other species appearing in at least three cultures. Samples of dung collected from small mammals did not yield any myxomycetes.

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Context. The diversity of myxomycetes associated with Australia’s most diverse native conifer genus, Callitris, has been incompletely studied. Aims. In this study, we examine the diversity of myxomycetes associated with outer bark, fallen cones and dead litter (leaves/ needles) of four Callitris species. Methods. Substrate samples were collected from 13 localities in New South Wales, Queensland and the Northern Territory. Samples were used to prepare moist-chamber cultures, and species of associated myxomycetes were identified. Key results. Twenty-three species in 15 genera were recorded. Percentage occurrence of myxomycetes varied depending on substrate, being 87% (cones), 83% (bark) and 63% (litter). Bark yielded the most species (17), followed by litter (10) and cones (6). Only two species ( Arcyria cinerea and S. fusca) were recorded from all three substrates. Substrate pH is often an important factor for the occurrence of myxomycetes, but the mean values recorded for cones (5.7), litter (5.8), and bark (5.9) showed little difference. This suggests that other undetermined factors contributed to the differences in species occurrence. In addition to the records generated in the present study, we provide a list of previous records of myxomycetes found in association with Callitris. Conclusions.This study has highlighted, for the first time, the diversity of myxomycetes associated with members of the genus Callitris and has shown the importance of cypress pines as a substrate for myxomycetes. Implications. This study leads to a better understanding of the biogeography, distribution and ecology of myxomycetes and their associated organisms.