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The morphology, anatomy and life history of a complanate form of Scytosiphon lomentaria (Scytosiphonales, Phaeophyta) from southern 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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Authors and Affiliations

  1. Botany Department, Monash University, Clayton, Victoria, Australia

    M. N. Clayton

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  1. M. N. Clayton
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Communicated by G.F. Humphrey, Sydney

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Clayton, M.N. The morphology, anatomy and life history of a complanate form of Scytosiphon lomentaria (Scytosiphonales, Phaeophyta) from southern Australia. Mar. Biol. 38, 201–208 (1976). https://doi.org/10.1007/BF00388933

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  • DOI: https://doi.org/10.1007/BF00388933

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