Abstract
SUMMARY1. The karyological cycle in the life-history of Flammula dilepis, brown-spored member of the family Agaricaceae, has been studied in detail.2. Young binucleate basidia are the dilated hyphal tips, each having a simple clamp-connexion at the base. This dicaryotic condition comes to an end with the fusion of these two nuclei of a basidium forming a synkaryon. This synkaryon then enlarges and ultimately undergoes reduction division (heterotypic). With the onset of prophase, chromosomes make their appearance and during metaphase 6 clear bivalents are evident (2 n = 12). Bivalents then separate and the two sets form two daughter nuclei, each with 6 chromosomes. The second division is homotypic and the four daughter nuclei thus formed also contain six chromosomes (n = 6) each. The orientation of the spindle in the first division of meiosis is always transverse, while it is irregular during the second division. The four daughter nuclei then migrate into the four developing basidiospores through the steri...
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