Control of formation of receptacles in Fucus distichus L. subsp. distichus (Phaeophyceae, Fucales)

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Abstract
In Fucus distichus subsp. distichus, along the exposed Atlantic coast of Nova Scotia, there is a marked seasonality in occurrence of receptacles which are present from late autumn to late spring when the sea temperature is low and the photoperiod reduced. Excised vegetative apices were incubated under laboratory conditions with various regimes of temperature and photoperiod. When the light period was 12 or 8 hr per day, receptacles were formed, whereas apices remained vegetative when the light period was increased to J 6 hr per day. Apices incubated under long-day conditions for periods up to twelve weeks formed receptacles when transferred to short-day conditions. Total illuminance and temperature had no effect on formation of receptacles. Excised apices stored in darkness at 50 responded over a period of one year as freshly collected apices.

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