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(The effect of temperature and light on Luetzelburgia auriculata (Alemao) Ducke seed germination). Luetzelburgia auriculata (Alemao) Ducke is a native tree species in Brazil with wood that is economically important in construction, carpentry and production of firewood and charcoal. A laboratory experiment was carried out to analyze seed germination of L. auriculata in the presence and absence of light, as well as constant temperatures of 20, 25, 30, 35, 40 degrees C and alternating temperatures of 20-45 degrees C, all under a photoperiod of 12 hours and continuous darkness. The variables evaluated were: percentage, speed and medium time of germination. The seeds germinated in the presence and absence of light, the highest percentages of germination were at 20-40, 20, 25, 30 and 35 degrees C and the lowest at 40 degrees C. The seeds were indifferent to light. The optimum temperature range was between 25 and 30 degrees C, which promoted a high germination rate and a lower average germination time.