M. foliacea var. spinosa G.A. Prowse ex Levanets & Guiry, 2021: 2.

Levanets, Anatoliy & Janse van Vuuren, Sanet, 2023, Morphology, taxonomy, biogeography and ecology of Micrasterias foliacea Bailey ex Ralfs (Desmidiales, Zygnematophyceae), PhytoKeys 226, pp. 33-51 : 33

8. M. foliacea var. spinosa G.A. Prowse ex Levanets & Guiry, 2021: 2.

Micrasterias foliacea var. spinosa G.A. Prowse, nom. inval. 1969. “Gardens’ Bulletin", Singapore 24: 341, Pl. 4, text-fig. 2(a). Basionym.

Morphology.

The variety differs from all other forms because the isthmus is widely opened and due to the large width of the gap between the subterminal and terminal lobes. Pairs of prominent sharp teeth are borne on either side of the isthmus and on both sides of the base of terminal lobes. Cells 72-75 μm long., 68-70 μm wide, isthmus 8 μm wide ( Prowse 1969).

Distribution.

Its current known distribution is limited to only one location in the Malayan peninsula (Suppl. material 2 and Fig. 2 ).

Habitat and ecology.

Variety Micrasterias spinosa was commonly found, together with var. Micrasterias spinosa quadrinflata , in the Tasek Bera forest swamp lake for which ecological conditions are described in the paragraph on var. Micrasterias spinosa quadrinflora above.

Figures

Figure 2. Worldwide distribution of different varieties of Micrasterias foliacea.