Batrachospermum (Batrachospermales, Rhodophyta) in Australia and New Zealand: New taxa and records in Sections Contorta and Hybrida

Royal Botanic Gardens Melbourne, Melbourne, Victoria, Australia
Australian Systematic Botany (Impact Factor: 1.08). 09/1999; 12(4). DOI: 10.1071/SB98023


Six species of Batrachospermum from Australia and New
Zealand have a twisted to coiled carpogonial branch and determinate
gonimoblast filaments, and are therefore referable to section
Contorta or Hybrida.
Batrachospermum australicum KÜtz. ex sp. nov. from
large rivers in tropical Northern Territory has a tightly 3-coiled carpogonial
branch; B. vittatum sp. nov. from tropical Northern
Territory has a characteristic longitudinal mid-whorl band of spermatangia;
and B. deminutum sp. nov. from a single locality in
eastern-central New South Wales has reduced whorls and long carpogonial
branches. The other three species are cosmopolitan in distribution:
B. virgatodecaisneanum Sirodot is widespread but
uncommon in temperate regions of both countries;
B. ambiguum Montagne is widespread and common in
tropical Australia; and B. globosporum Israelson is
restricted in Australia to near Brisbane in subtropical southern Queensland.

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    • "Taxonomic notes: This taxon was referred previously (Entwisle and Foard 1999, 2007) to K. ambigua (as Batrachospermum ambiguum), but with some qualifications (see Entwisle and Foard 1999): compared to contemporary reports of K. ambigua from elsewhere (Kumano 1990, Sheath et al. 1992), the Australian specimens have generally broader rhizoidal filaments, sometimes longer fascicle cells, shorter carpogonial branch cells and generally larger carposporangia. As was also reported in Entwisle and Foard (1999), the Australian specimens always have sessile trichogynes, contrary to at least some published reports of K. ambigua (Sheath et al. 1992) and confirmed in this study for a broader range of samples. "
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