The morphology,anatomy and life history of a complanate form of Scytosiphon lomentaria (Scytosiphonales,Phaeophyta) from southern Australia |
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Authors: | M N Clayton |
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Institution: | (1) Botany Department, Monash University, Clayton, Victoria, Australia |
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Abstract: | Complanate Scytosiphon lomentaria (Lyngbye) J. Agardh is characterised and distinguished from the typical cylindrical form by a flattened thallus, plurilocular sporangia having a mucilaginous covering layer, and an autumn-spring seasonal growth pattern. Cultural studies show that zooids from the plurilocular sporangia give rise to an independent ralfsioid stage, to ralfsioid plethysmothalli bearing complanate fronds, and to a cylindrical form of S. lomentaria. In culture, the complanate thalli are initiated only in short-day conditions, cylindrical thalli are initiated in both short- and long-day conditions. Ralfsioid thalli are of two kinds: one developing independently of day length, the other developing only during long days; the alternative short-day thallus form is complanate. |
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