Abstract

RINCON-B., EDGAR J.; PINZON-Q., LUIS E.; BERMUDEZ-A., HELBER  and  GARCIA-P., HUMBERTO E.. Taxonomy and distribution of Hildenbrandia angolensis (Hildenbrandiales: Rhodophyta) in Colombia . Caldasia [online]. 2006, vol.28, n.2, pp.267-274. ISSN 0366-5232.

This study is the first report for Colombia of the genus Hildenbrandia, representing the first record of a freshwater Rhodophyta. It is includes the detailed description of the morfometrics characters, as well as the environmental distribution of the populations collected from three localities of the department of Santander. It is concluded that the species fit within Hildenbrandia angolensis circumscription; it is characterized by it is small cell diameter (= 4.8 μm) and of tropical or subtropical distribution. Vegetatives propagules were reported in one single population. H. angolensis occurred in rivers near to cascade zones, with temperature of 16- 18 ºC, pH circumneutral to slightly alkaline (6.9-7.6), high ion content (272-1174 μS cm-1), high current velocity ( 140 cm s-1) and shallow waters (< 60 cm); algal cover of this species on the rock ranged from 3.2 to 4.1 m2. H. angolensis is reported in upper streams basins of the Oro and Frio streams, in dry forest to very humid low montane belonging to Piedecuesta and Floridablanca municipalities ( Santander, Colombia ).

Keywords : Colombia; ecology; Hildenbrandia; Rhodophyta; streams; taxonomy.

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