Abstract

Abstract Sixteen isolates in the orders Blastocladiales, Chytridiales, Rhizophydiales and Spizellomycetales were incubated for 2 d in liquid PYG growth medium at 33, 37, 40, 45 and 50 °C. These fungi could not resume growth when returned to 20 °C if the temperature of incubation was more than a few degrees above the maximum temperature for growth on solid PYG growth medium. The maximum temperatures for survival of some chytrids are probably close to the temperatures reached periodically on the surface of moist soils in warm climates. Desiccated thalli of chytrids in the Blastocladiales and Spizellomycetales can survive much higher temperatures than chytrids in the Chytridiales and Rhizophydiales. Therefore, the maximum temperature and moisture content of the soil could significantly affect the diversity of chytrids in the ecosystem.

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