Groenbladia neglecta (Raciborski) Teiling var. elongata Scott & Grönblad, 2020

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 : 7

Groenbladia neglecta (Raciborski) Teiling var. elongata Scott & Grönblad , Acta Societatis Scientiarum Fennica: nov. ser. B, 2(8): 48, pl. 35, fig. 17-25. 1957.

( Figs. 14 A-B)

Cells 4-5 times greater in length than width, 44-84 × 7-15 μm, 6-13 μm broad at the apex. Semicells cylindrical; broadly truncated apical margins; parallel lateral margins; subquadrate angles; shallow and broad median constriction; median sinus with a small invagination; hyaline cell wall; axial chloroplast.

Material examined: BRAZIL, AMAPÁ, Macapá, Curralinho Lake , 02.VI.2007, C.B. Araújo (SP469217), 03.VII.2007, C.B. Araújo (SP469218), 14.I.2008, C.B. Araújo (SP469223), 12.II.2008, C.B. Araújo (SP469224), 15. IV.2008, C.B. Araújo (SP469226), 13.V.2008, C.B. Araújo (SP469227), 15.VII.2008, C.B. Araújo (SP469228) .

Comments: this variety differs from the typically observed characteristics of the species, as it presents longer cells and a median sinus with a small invagination.

Distribution in Brazil: Amazonas (Förster 1974, Souza 2008, Souza & Melo 2010); Bahia ( Oliveira et al. 2010); Pará ( Scott et al. 1965, Förster 1969).

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.