Pediastrum duplex Meyen

Hilgert-Moreira, Suzane Both & Lorscheitter, Maria Luisa, 2025, Identification of palynomorphs sampled from a sedimentary profile of the last 5000 years in Lagoa dos Patos, Rio Grande do Sul, southern Brazil., Acta Botanica Brasilica (e 20240187) 39, pp. 1-15 : 6

11. Pediastrum duplex Meyen

( Fig. 3I, J )

Discoid colony, hyaline, clathrate,with a flattened star-like shape. Size variable, with ca. 16 smooth-walled to microverrucate cells. Bifurcated cells at the periphery of the colony, with characteristic elongated processes. Internal cells with distinct morphology. Colony diameter ca. 40–123 µm (x 68 µm). As in P.boryanum , colony usually found with irregular folds in sediment due to its fragile structure. Ecological data: as described for P. boryanum .

Figures

Figure 3. Algae. A–C. Operculodinium centrocarpum (Deflandre & Cookson) Wall, A, B: 1º–2º pl; D, E. Spiniferites mirabilis (M.R.Rossignol) Sarjeant:1º–2º pl; F,G.BotryococcusKützing:1º–2º pl; H.Pediastrum boryanum (Turpim) Meneghini; I, J. Pediastrum duplex Meyen (pl planes).