An Euastrum species (Conjugatophyceae, Streptophyta) was found in an agricultural ditch fed by a rheocrenic, slightly-hot spring ‘Ain El-Balad’ in the El-Farafra Oasis, Western Desert of Egypt. Morphotaxonomic diagnosis and autecology of... more
An Euastrum species (Conjugatophyceae, Streptophyta) was found in an agricultural ditch fed by a rheocrenic, slightly-hot spring ‘Ain El-Balad’ in the El-Farafra Oasis, Western Desert of Egypt. Morphotaxonomic diagnosis and autecology of this desmid species are hereby documented in detail and compared to other morphologically similar species and infraspecific taxa, particularly those of the species complex E. spinulosum. As compared to most other species of that complex, the newly described Euastrum species is mainly characterized by its distinctive small-sized cells, rather shallow and widely open invaginations between the semicell lobes and less pronounced apical lobes. Moreover, the basal lobes are broadly rounded and larger than the lateral lobes. We have named this interesting species E. elfarafraense sp. nov . after the type locality , the El-Farafra Oasis.
Op basis van een 20-tal stalen is een voorlopige soortenlijst gemaakt van de sieralgen (Desmidia-ceeën) van het Vlaams natuurreservaat Walenbos. De bijzondere soorten, waaronder vijf soorten ridderkruisen (Micrasterias), zijn vooral te... more
Op basis van een 20-tal stalen is een voorlopige soortenlijst gemaakt van de sieralgen (Desmidia-ceeën) van het Vlaams natuurreservaat Walenbos. De bijzondere soorten, waaronder vijf soorten ridderkruisen (Micrasterias), zijn vooral te vinden in de vochtige en natte schraalgraslanden. Het gaat enerzijds om soorten kenmerkend voor een eerder zuur, matig voedselarm (mesotroof) milieu en anderzijds soorten van tijdelijk droogvallende plaatsen.
Cite as: Osório, N.C. et al. Periphytic Cosmarium (Zygnematophyceae, Desmidiaceae) in lentic environments of the Upper Paraná River floodplain: Taxonomy and ecological aspects. Acta Limnologica Brasiliensia, 2018, vol. 30, e203.... more
Cite as: Osório, N.C. et al. Periphytic Cosmarium (Zygnematophyceae, Desmidiaceae) in lentic environments of the Upper Paraná River floodplain: Taxonomy and ecological aspects. Acta Limnologica Brasiliensia, 2018, vol. 30, e203.
Abstract: Aim: A taxonomic study of the species of the genus Cosmarium Corda ex Ralfs (Desmidiaceae) was conducted in two lentic environments of the Upper Paraná River Floodplain (Garças and Patos lakes). Methods: The samples were collected in November 2016. Two petioles of Eichhornia azurea (Sw) Kunth were sampled and analyzed qualitatively. Results: Six species, nine varieties, and three forms were identified, with five taxa being common to both lakes, nine in Garças Lake, and four in Patos Lake. Of this, thirteen species represent the first records for the floodplain environment. Conclusion: This study contributes to the knowledge of the biodiversity of this region, providing support for future ecological studies and biomonitoring.
Eighty eight Zygnematophyceae taxa were found in Filinskoe marsh (samples were collected in 2013). 13 species of Desmidiales appeared to be new for Moscow Region. Their original light microscope and scanning electron microscope photos are... more
Eighty eight Zygnematophyceae taxa were found in Filinskoe marsh (samples were collected in 2013). 13 species of Desmidiales appeared to be new for Moscow Region. Their original light microscope and scanning electron microscope photos are adduced. Their characteristics and the habitat conditions at the moment of collecting samples are stated.
Algae samples were collected in swamps located at Pavlov-Posad in Moscow Region. There were found 141 species and varieties, 30 taxa of them being new to the region and 6 taxa being new to the Russia. Descriptions of the taxa were... more
Algae samples were collected in swamps located at Pavlov-Posad in Moscow Region. There were found 141 species and varieties, 30 taxa of them being new to the region and 6 taxa being new to the Russia. Descriptions of the taxa were specified by observation of cell wall ornamentation with scanning electron microscopy. Original descriptions and photos of new for Russia algae are presented.
