Desmidium baileyi (Ralfs) Nordstedt var. baileyi f. baileyi

Araújo, Camila Barbosa de, Bicudo, Carlos Eduardo de Mattos, Takiyama, Luís Roberto & Melo, Sérgio de, 2020, Pseudofilamentous desmids (Zygnematophyceae) from an Amazonian floodplain lake (Macapá, AP, Brazil), Iheringia, Série Botânica (e 2020010) 75, pp. 1-14 : 5

Desmidium baileyi (Ralfs) Nordstedt var. baileyi f. baileyi , Acta Universitatis lundensis 16:4. 1880.

Aptogonum baileyi Ralfs , The British Desmidieae. 208, pl. 35, fig. 1a-c. 1848.

( Fig. 6 )

Cells were about equal in length and width, 18-22 × 18-21 μm, and the cells were joined at their apex. Semicells rectangular; parallel lateral margins with small undulations; apical margin concave with long angular projections forming a more or less cylindrical connective process that overlap adjacent cells; indistinct or unclear median constriction; median sinus reduced to a slight undulation; hyaline cell wall; axial chloroplast.

Material examined: BRAZIL, AMAPÁ, Macapá, Curralinho Lake , 14.I.2008, C.B. Araújo (SP469223), 15.IV.2008, C.B. Araújo (SP469226), 13.V.2008, C.B. Araújo (SP469227) .

Comments: this species is easy to identify, due to the angular cylindrical processes that connect the cells into pseudofilaments. Semicell margins are smooth or slightly undulated in the presently examined specimens.

Distribution in Brazil: Amazonas (Förster 1974, Martins 1980, Souza & Melo 2010); Bahia ( Oliveira et al. 2010); Mato Grosso ( De-Lamonica-Freire 1992); Pará ( Scott et al. 1965, Förster 1969); Paraná (Bittencourt-Oliveira 1993b, Picelli-Vicentim 1984); Rio de Janeiro ( Sophia 1987); Rio Grande do Sul ( Borge 1903, Bicudo & Ungaretti 1986, Burliga et al. 2016); São Paulo ( Bicudo & Bicudo 1965, Bicudo 1969, Bicudo & Samanez 1984, 2016, Bicudo et al. 1999).

Figures

Figs. 3-15. Pseudofilamentous desmids of Curralinho Lake, Macapá, Amapá, Brazil. 3 A-C. Bambusina borreri. A, B. detailed cells; C. detailed pseudofilament; 4. B. borreri var. brasiliensis; 5 A-B. B. borreri var. majus, detailed cells and pseudofilaments; 6. Desmidium baileyi var. baileyi f. bailey; 7 A-B. D. elegans. A. detailed pseudofilament, B. detailed cell; 8 A-B. D. graciliceps var. graciliceps. A. frontal view of the pseudofilament, B. slight modification of the pseudofilament frontal view; 9. D. graciliceps var. groenbladii; 10 A-C. D. longatum. A. pseudofilament frontal view, B. formation of the elongate conjugation tube, C. zygospore; 11 A-B. D. quadratum var. quadratum. A. detailed pseudofilament, B. detailed cells; 12. D. quadratum var. constrictum; 13 A-B. Groenbladia neglecta var. neglecta. A. detailed pseudofilament, B. detailed cells; 14 A-B. G. neglecta var. elongata. A. detailed pseudofilament, B. detailed cells; 15. Haplozyga armata var. armata. Scale bars = 10 µm.