Cosmarium heptangulare Lacoste de Díaz (1972:212)

Ramos, Geraldo José Peixoto, Santos, Maria Aparecida Dos & Moura, Carlos Wallace Do Nascimento, 2021, Taxonomic notes on some Cosmarium species (Desmidiaceae, Zygnematophyceae) from Brazil, Phytotaxa 483 (3), pp. 291-299 : 292-293

publication ID

https://doi.org/ 10.11646/phytotaxa.483.3.9

DOI

https://doi.org/10.5281/zenodo.6492948

persistent identifier

https://treatment.plazi.org/id/6F25BE49-3503-0D30-5EE5-8A2443DEFE8C

treatment provided by

Marcus

scientific name

Cosmarium heptangulare Lacoste de Díaz (1972:212)
status

 

Cosmarium heptangulare Lacoste de Díaz (1972:212) ( Figs 3 View FIGURES 1–8 , 22–26 View FIGURES 9–32 )

Cell dimensions: 18–22 μm long, 18,5–22 μm wide, isthmus 6–7 μm wide.

Material examined:— BRAZIL. Pantanal dos Marimbus, Andaraí, Bahia State. Sample: HUEFS 241798 About HUEFS .

Habitat: —This taxon was found associated with periphyton of Utricularia foliosa . EC 0.07 (± 0.03 mS cm-1), DO 6.6 (± 0.3 mg L- 1), pH 6.6 (± 0.6), TDS 0.03 (± 0.01), T 27.6 (± 0.2 ºC), WT 0.7 (± 0.14 m).

Note:—This species was originally described by Lacoste de Díaz (1972) based on samples gathered in Valinhos, São Paulo, Southeastern Brazil. This was the only record of this species till now. Almost 50 years later, it was found again in Brazil, but now in Bahia, Northeast region.

The cell outline (7–8 angled), as well as wide and straight apices are the main morphological features of this species. The SEM analysis revealed that the cell wall is slightly scrobiculate (pock marked pattern) ( Fig. 26 View FIGURES 9–32 ).

Another feature which we consider relevant in this species is the apical view, which is oblong. Somewhat similar species such as Cosmarium lapponicum ( Borge 1913:19) , and C. fontigenum Nordstedt ( Wittrock & Nordstedt 1878: 71) have elliptical cells when observed in apical view.

DO

Société d'Agriculture Sciences et Arts

T

Tavera, Department of Geology and Geophysics

Kingdom

Plantae

Phylum

Charophyta

Class

Conjugatophyceae

Order

Zygnematales

Family

Desmidiaceae

Genus

Cosmarium

Loc

Cosmarium heptangulare Lacoste de Díaz (1972:212)

Ramos, Geraldo José Peixoto, Santos, Maria Aparecida Dos & Moura, Carlos Wallace Do Nascimento 2021
2021
Loc

Cosmarium heptangulare Lacoste de Díaz (1972:212)

Lacoste de Diaz, E. N. 1972: )
1972
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