Sporophore production by Termitomyces striatus from mycelia growing in the ‘comb’ in the subterranean nest of Pseudacanthotermes militaris was studied over three rainy seasons. Log number of sporophore primordia was linearly related to log diameter of the comb. The modal number of successful primordia was 1. Rainfall of more than 2 cm/day initiated a flush of sporophore production. The flush was observed 9–14 days after initiation and lasted 3–7 days. The data suggest that the Chanter-Thornley model for sporophore production in Agaricus could be adopted, with minor adaptations, to explain the fruiting pattern observed.