Novos registros de táxons dos gêneros Euastrum Ehrenb. ex Ralfs e Micrasterias C. Agardh ex Ralfs (Zygnematophyceae, Desmidiaceae) para a Bahia e o Brasil

Abstract

Os materiais estudados provieram de 230 unidades amostrais coletadas em dois períodos, no verão (janeiro-março de 2009) e inverno (junho-agosto de 2009). São fornecidas descrições e comentários com táxons afi ns, bem como ampliada a distribuição geográfi ca destes para o nordeste e o Brasil.

Taxonomic notes on the species of the genus Micrasterias (Desmidiaceae, Conjugatophyceae) from the Metropolitan Region of Salvador, Bahia, Brazil

“…The diversity of Micrasterias found in Mata de São João was similar to that found by Oliveira et al (2017), who reported 28 taxa occurring in APA Litoral Norte, of which 23 occurred in the aforementioned municipality; 3 taxa listed by the authors were not found in the present study: M. prescottiana C. Bicudo Oliveira et al (2009) for the APAs Lagoas de Guarajuba and Rio Capivara (both in the municipality of Camaçari), there was an increase in the number of taxa from 14 to 18, with M. abrupta, M. radians, M. radiosa var. radiosa and M. radiosa var.…”

“…When comparing our data (Table 1) with previous inventories in the MRS by Oliveira et al (2009Oliveira et al ( , 2017 and Santos et al (2016), it is evident that our study contributes the most to the knowledge of the diversity and geographic distribution of Micrasterias because it surveyed a greater number of municipalities (11) and recorded a greater number of taxa (29).…”

“…expansa differs from the typical variety because it has subcunate apical lobe that is always smaller than the set of basal lobes, an apical margin that always has a slight median depression and extremities with divergent spines (Sormus 1980, Oliveira 2017. This variety has a restricted distribution in Brazil, with records only for 3 states: Bahia (Oliveira et al 2017), Minas Gerais (Nordstedt 1877), and São Paulo (Borge 1918). It is rare in the MRS but is occasional in the municipalities of Lauro de Freitas and Mata de São João (Table 2).…”

“…Notes. According to Oliveira et al (2017), M. radiosa var. radiosa is easily identified because it possesses circular contouring of the cell, deep incisions, and narrow lobules.…”