Synonyms: Cosmarium undulatum var. obtusatum Schmidle AlgaeBase*

Description: L 48.7–65.2um, Br 37.8–50.8um, Isth 10.9–17.4um, Th 23.4–30.3um, L:Br 1.2–1.3. Cells contained about 7–9undulations on margins, two rows of intramarginal undulations which resembled granules, and two pyrenoids per semicell. (Dingley 2001) L 67.1–74.9um, Br 51.2–56.9um, I 19.1–22.3um, Th 31.0–34.4um, L:Br 1.2–1.49. These cells are somewhat larger than normal. The cell shape and dispostion of granules was rather variable within the population. The majority of cells in front view had two rows of intra marginal granules reaching almost to the apex (Fig. 5b) but a few cells had one or three rows (Figs 5a, 5c, 5d). They also appeared to show a combination in the arrangement of granules as depicted in Croasdale (1956) plate 7, figs 14 & 15. In lateral view the semicells in this study are sub circular and the granules are stronger near the isthmus becoming gradually fainter towards the apices, which are devoid of any granules. In apical view the cells are elliptic with a broad median inflation. The arrangement of granules in Ruzicka 1953, Fig. 18, appears similar to the cells in this sample. See also Bourrelly & Coute 1991, pl. 31, Fig. 5; Skuja 1949, pl. 30, Fig. 25a for similar figures. The distinguishing feature of all of the cells in this sample is that in front view there is a prominent array of shapr granules, almost spine-like, near the basal margins. (Dingley 2002)

State distribution in Australia, based on available literature

new record for Australia (Dingley 2001)

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