Netrium oblongum
(De Bary) Lütkemüller, 1902
Most likely ID: n.a.
Synonym: n.a.
Sampling location: Sima Moor (Austria)
Phylogenetic tree: Netrium oblongum
Diagnosis:
- cells elongate ellipsoidal with rounded apices
- length 90–155 µµ, width 32–44 µm
- 2 chloroplasts with up to 8 ridges
- ridges of chloroplasts moderately dissected
- 1–3 spherical or elongate pyrenoids per chloroplast
I have only found Netrium oblongum in the Sima Moor in Austria. The specimens in my population were 100–110 µm long and mostly contained 2 pyrenoids per chloroplast.
Netrium oblongum differs from the similar species Netrium digitus in the size, cell shape and form of the chloroplasts. Netrium digitus is considerably longer (90–430 µm) and the cells become narrower towards the ends and are therefore almost spindle-shaped. The apices are often truncated or broadly rounded. The chloroplasts of Netrium digitus is more strongly dissected. The resulting lobes are often notched.
Fig. 1 a-b: Netrium oblongum. L = 103 µm. Two focal planes of a slightly squashed specimen. Note the dissected ridges of the chloroplasts (DC). PY = pyrenoids. Obj. 100 X.
Fig. 2 a-b: Netrium oblongum. L = 103 µm. The same specimen as shown in fig. 1 a-b in brightfield illumination. Obj. 100 X.
Fig. 3 a-b: Netrium oblongum. L = 108 µm. Two focal planes of a second specimen. Obj. 100 X.