Abstract
If a thick median slice is cut from an active stroma of Daldinia concentrica and laid horizontally on a glass plate, a spore deposit collects overnight as a black band about 1·0 cm. wide and separated from the edge of the stroma by a more or less spore-free region 0·2–0·3 cm. wide. Further the spore deposit is zoned with several darker regions parallel with the surface of the stroma alternating with paler zones. It is suggested that both the considerable width of the deposit and its zoning are associated with the discharge of projectiles ranging from single spores to groups of eight.
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