Formation of adventive embryos from rhizoidal filaments in sporelings of four species of Fucus (Phaeophyceae)

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Abstract
In culture adventive embryos were initiated from secondary rhizoidal filaments of sporelings of Fucus distichus subsp. distichus, F. edentatus, F. serratus, and F. vesiculosus. This was not a response to wounding, but seemed to appear spontaneously under various conditions of temperature, light, and nutrition. Only in subsp. distichus did the parent sporeling and its embryos grow significantly, and thereby contribute to the bushy habit of this species. Attempts to grow detached rhizoidal filaments in culture were unsuccessful, but excision of filaments stimulated formation of adventive embryos.
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