Life history of Hydroclathrus clathratus (Scytosiphonaceae, Phaeophyta) in the Azores

Marisa Freitas Toste, Manuela Isabel Parente, Ana Isabel Neto*, Robert Lawson Fletcher

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Hydroclathrus clathratus is a common species on the rocky intertidal shores of the Island of São Miguel, Azores, mainly in spring and summer. Fertile saccate thalli appear in spring and disappear from late summer onward. Two types of life history were observed in culture: a direct-type and a heteromorphic, monophasic life history. In the direct type, reproductive cells from erect plants collected in the field developed directly into new erect thalli with plurilocular sporangia. In the heteromorphic life-history pattern, plurispores from the plurilocular sporangia of the erect thalli developed into filamentous prostrate microthalli. These developed unilocular and plurilocular sporangia in both short-day and long-day conditions at 15-22°C. Unispores released from the unilocular sporangia developed into saccate thalli, whereas plurispores gave rise to filamentous prostrate microthalli.

Original languageEnglish
Pages (from-to)209-218
Number of pages10
JournalCryptogamie, Algologie
Issue number3
Publication statusPublished - Sept 2003


  • Hydroclathrus clathratus
  • Life history
  • Morphology
  • Phaeophyta
  • Scytosiphonaceae


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