SUMMARYThick‐walled, oil‐filled akinetes of the green algaSpongiochloris typica,long in the stationary phase of growth, were transferred to fresh media. Ultra‐structural changes were observed during a 51‐hr period after transfer. Akinetes, when transferred to fresh media, may follow 1 of 3 pathways:1Remain unchanged; these cells appear to be moribund perhaps due to an over‐accumulation of lipid.2Undergo immediate zoosporogenesis; seems to occur in cells with 4, 8, or more nuclei.3Return to the vegetative state; this was common in smaller cells with less than 4 nuclei; however, zoosporogenesis eventually did occur when 4, 8, or more nuclei wer