Aigara Miranda Alves

Os gêneros Chaetomorpha Kütz. nom. cons. e Rhizoclonium Kütz. (Chlorophyta) do litoral do Estado da Bahia, Brasil

This paper presents a taxonomic study of the genera Chaetomorpha and Rhizoclonium occurring in the littoral of Bahia. The species were defined based on habit, presence or absence of lateral rhizoids, basal cell type, shape and cells dimensions. The presence of crystalline inclusions in cells was also verified. It were identified nine species, seven to the genus Chaetomorpha (C. aerea (Dillwyn) Kutz., C. antennina (Bory) Kutz., C. brachygona Harv., C. clavata Kutz., C. crassa (C. Agardh) Kutz., C. minima Collins & Herv. and C. nodosa Kutz.) and two to the genus Rhizoclonium (R. africanum Kutz. and R. riparium (Roth) Kutz. ex Harv.). Chaetomorpha crassa, C. minima and C. nodosa are new additions to the Northeastern of Brazil and C. aerea, C. clavata and R. africanum are additions to the Bahia. Three crystals types were found: 1. clusters of fine needle-shaped of silica crystals presents in C. aerea, C. antennina, C. brachygona, C. clavata and C. crassa; 2. octahedral of calcium oxalate crystals found in C. antennina and C. clavata and, 3. globular aggregates of cone-shaped calcium carbonate crystals observed in C. clavata. Fertile thallus of C. antennina, C. clavata, C. nodosa, R. africanum and R. riparium are being illustrated for the first time for the Brazilian coast. The vegetative and reproductive structures are described in detail and a comparison with similar species is provided.

The genus Cladophora (Chlorophyta) in the littoral of Bahia, Brazil

Abstract: In this taxonomic treatment of Cladophora, fourteen species are described and illustrated from the littoral zone of Bahia, Brazil: Cladophora aokii, C. brasiliana, C. catenata, C. coelothrix, C. conferta, C. crispula, C. corallicola, C. dalmatica, C. laetevirens, C. montagneana, C. ordinata, C. prolifera and C. vagabunda. Two species have an extended global distribution: Cladophora aokii (Atlantic) and Cladophora conferta (Brazilian littoral zone), whereas C. brasiliana, C. corallicola and C. laetevirens were distributed as far as the northeast coast of the Brazilian littoral zone. The need to review the representatives cited for C. corallicola in the Brazilian littoral zone is clear, given that this analysis has classified herbarium specimens from Espirito Santo, Rio de Janeiro and Santa Catarina as C. aokii. The habit, thallus morphology, branching pattern, origin of rhizoids, presence of annular constrictions, diameter and length of cells were important traits in classifying the studied taxa.

Morphology and taxonomy of Anadyomene species (Cladophorales, Chlorophyta) from Bahia, Brazil

Abstract We made a taxonomic study of representatives of Anadyomene occurring off the coast of Bahia State, Brazil. Six species were identified: A. lacerata, A. linkiana, A. pavonina, A. rhizoidifera, A. saldanhae and A. stellata. This is the first report of A. rhizoidifera since the original description of the species. Non-birefringent proteinaceous crystalline inclusions in the form of tetrahedrons were recorded for the first time in the genus. Fertile thalli of A. saldanhae and A. stellata were also encountered for the first time along the Brazilian coast. A. stellata has the widest distribution along the coast of Bahia State; it was found from the intertidal region to depths of 100 m. A. rhizoidifera occurred in only a single, intertidal collection. A. lacerata, A. linkiana, A. pavonina and A. saldanhae occurred only in the near-shore zone at a minimum depth of 20 m. Detailed descriptions, illustrations and comparisons with related taxa are provided.

Polyphysaceae (Dasycladales, Chlorophyta) in Todos os Santos Bay, Bahia, Brazil

In this paper, we summarize the diversity of Polyphysaceae species in Todos os Santos Bay, in the state of Bahia, Brazil. On the basis of ten years of collections and the analysis of herbarium material, six species have been recorded for the area: Acetabularia caliculus J.V.Lamour. in Quoy & Gaimard; A. crenulata J.V.Lamour.; A. schenckii Mobius; Parvocaulis myriosporus (Joly & Cord.-Mar.) C.W.N.Moura & J.C.De Andrade comb. nov.; P. pusillus (M.Howe) Berger et al.; and P. parvulus (Solms) S. Berger et al. The last has a distribution extending to the southern Atlantic Ocean. Acetabularia myriospora was transferred to Parvocaulis (as P. myriosporus) on the basis of its short corrugated peduncles and lack of a lower corona in the gametangial ray discs, which are diagnostic characters of this genus. In Todos os Santos Bay, Acetabularia species are more widely distributed than are Parvocaulis species, which are currently restricted to Itaparica Island. The most common taxa were A. caliculus and A. schenckii, which were collected from the majority of the study sites. This paper provides detailed descriptions of the morphology, reproductive aspects and geographic distributions of the algae, as well as discussing the taxa studied.

Microdictyon (Chlorophyta, Anadyomenaceae) from the State of Bahia, Brazil

A morpho-taxonomic study of the genus Microdictyon from the littoral of Bahia, Brazil, is presented. The material studied was obtained by dredging in the infralittoral of the Municipality of Canavieiras, as well as from analysis of material collected along the Bahia coast and deposited in the herbaria SPF and RFA. The genus is characterized by a flat thallus, astipitate, monostromatic, composed of open, reticulate laminae formed by apical cell-coalition. Three species were identified, M. boergesenii, M. pseudohapteron and M. umbilicatum, which were defined based on the type of adhesion pads at the tip of cells, presence or absence of constrictions and differences in branching pattern. Microdictyon pseudohapteron presents crenulated adhesion pads on the tip of cells whereas M. boergesenii and M. umbilicatum present apical annulated adhesion, the latter two differing by branching patterns and the presence or absence of constriction. Descriptions, illustrations and comparison with related taxa are provided.