<i>Achnanthes</i> Bory Sensu Stricto (Bacillariophyta) from Terrestrial Habitats of Rio de Janeiro (Brazil), with Description of <i>Achnanthes pseudoinflata</i> sp. nov.
Mateusz Rybak | Łukasz Peszek | Łukasz Skoczylas | Teresa Noga | Luc Ector | Carlos E. Wetzel
The aim of the present work was to present the ecological and morphological characteristics of species from the genus <i>Achnanthes</i> Bory <i>sensu stricto</i>, which develops in terrestrial mosses near the Rio de Janeiro Botanic Garden, Brazil. A literature comparison was made with other similar species, including the LM and SEM analysis of original material bearing <i>Achnanthes inflata</i> (Kützing) Grunow housed at the Grunow Collection in Vienna, and data from the available literature. Samples were collected from clumps of moss growing on tree trunks, and from a concrete wall within the botanic garden. Four taxa from the genus <i>Achnanthes</i> were recorded: <i>A. coarctata</i>, <i>A. inflata</i> var. <i>gibba</i>, <i>A. mauiensis</i> and <i>Achnanthes pseudoinflata</i> sp. nov. The main morphological differences between these taxa were cell dimensions (length and width), striae and areolae density. The most common diatom species found in these samples were <i>Humidophila</i> sp. (90%), <i>Humidophila contenta</i> (74.8%), <i>Luticola moreirae</i> (17.9%), and <i>Achnanthes pseudoinflata</i> sp. nov. (7.4%).
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