Abstract
Following release from the sporangium, spores of Achlya intricata aggregate at the sporangial apex, round-off within 30 s and encyst. Rounding-off is delayed or prevented by depression of the external osmotic potential with sucrose, suggesting that net uptake of water is necessary for the change in shape to occur. The first spores to be released from the sporangium become bound to the outer surface of the sporangial wall, forming a sub-apical ring upon which other spores become attached. The spherical cluster of encysting spores continues to increase in size until 30 s after complete emptying of the sporangium. The initial aggregation of the spores is dependent upon extracellular Ca2+, though longer-term adhesion between cysts is Ca2+-insensitive.
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