The genus Nematoplaca has only been reported once, by Geitler & Ruttner from Indonesia, therefore it has been considered a rare genus. Its only described species is Nematoplaca incrustans Geitler. Bourrelly considered Nematoplaca synonymous with Desmosiphon
because both have a nematoparenchymatous habit and pseudodichotomous branching. More than 30 years later, Komárek, based on the original description, reaffirmed Nematoplaca as a genus and described its reproduction as occurring by fragmentation of trichomes and probably production
of hormogonia. We found a population from Tlanchinol, state of Hidalgo, Mexico that corresponds morphologically to Nematoplaca incrustans. In our observations we recognized hormogonium-like reproductive structures, but their origin and function were quite different from those of hormogonia.
These structures originated from an enlarged apical cell which divided and formed baeocytes, a new observation for the reproduction of Nematoplaca. This leads to the reinterpretation of the reproductive process and life cycle, and a reconsideration of taxonomic affinities. It is probable
that other closely related genera, where hormogonia or baeocytes have been reported, have the same type of reproduction as N. incrustans. Such would be the case in Capsosira, Pulvinularia, Doliocatella and Homoeoptyche.
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MULTIPLE SEQUENTIAL FISSION;
TRUE-BRANCHING CYANOPROKARYOTIC FILAMENTS
Document Type: Research Article
Publication date: August 1, 2017
This article was made available online on January 16, 2017 as a Fast Track article with title: "<i>Nematoplaca incrustans</i> Geitler (Nostocales, Cyanobacteria/Cyanoprokaryota): reinterpretation of the life cycle and validation of the generic status".
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Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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