Hydrodictyaceae

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

Family Hydrodictyaceae

10. Pediastrum boryanum

(Turpim) Meneghini

( Fig. 3H )

Discoid colony, hyaline, not clathrate, with a flattened star-like shape. Size variable, with 8–16 smooth-walled to microverrucate cells. Bifurcated cells at the periphery of the colony,with characteristic elongated processes. Internal cells with distinct morphology.Colonydiameter ca. 50–68µm(x55µm). Colony usually found with irregular folds in sediment due to its fragile structure. Ecological data: found in shallow freshwater environments such as lakes, marshes, and near deltas ( Erdtman, 1969; Rosa & Miranda-Kiesslich, 1988; Lorscheitter,1989; Torgan & Hentschke, 2011).

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).