Culture studies on artificially induced aplanospores and their development in the marine alga Boergesenia forbesii (Harvey) Feldmann (Chlorophyceae, Siphonocladales)
When the vegetative thallus of the gigantic unicellular marine alga, Boergesenia forbesii, is either placed in concentrated sea-water (×2.0) or subjected to mechanical stimulation (pinching with a pincette or probing with a fine glass needle), its protoplasm changes swiftly into numerous aplanospores. Most of these aplanospores develop into normal new plants in culture.