Abstract
1. Relative heat and desiccation resistances of tree twigs and grass culm bases were determined by raising the tissues to various temperatures. The treatments were followed by testing for tissue viability with 2,3,5-triphenyltetrazolium chloride. 2. Grass culm bases, including those of Hilaria jamesii, Bouteloua gracilis, B. eriopoda, and B. curtipendula, were the most sensitive tissues studied. Juniperus deppeana and Pinus edulis twigs were the least sensitive. Twigs of J. monosperma and J. osteosperma were intermediate. 3. Variations in heat resistance were negatively correlated with depression of the wet-bulb thermometer on the day of sampling. During hot, dry weather air temperatures at the soil surface were very near the lethal temperatures determined for grass culm bases. It is probable that fires at this time would be more damaging to grass plants than fires would be during cooler weather when lethal temperatures determined for culm bases are higher.
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