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Penium amplificatum Desmid Species Outer Hebrides

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Phylum: Charophyta   Family: Peniaceae

Penium amplificatum (M. Schmidt) M.C. van Westen & P.F.M. Coesel 2012

First described and illustrated by Schmidt (1903: 16, pl. 2: 19) as Penium spirostriolatum var. amplificatum. Much later in was raised to species level by Van Westen & Coesel (2012). From extensive field studies in the Dutch province of Drenthe and comparative literature research it appeared that P. spirostriolatum var. amplificatum differs from the nominate variety not only by its capitate cell ends but also by coarser and more spiralized ridges on the cell wall and by distinctly different ecological demands. Var. amplificatum, occurred exclusively in samples with pH<5 whereas var. spirostriolatum, was found predominantly in water with pH>5 (up to 7.3). - Abridged from the authors’ abstract.
Cell dimensions: L: 100-290 µm; B: 15-30 µm; L/B: 9-15.
Fairly common in moorland pools and abandoned peat-cuttings, especially with Sphagnum.

References: 
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
Ruzicka, J. (1977) Die Desmidiaceen Mitteleuropas, Volume 1, Part 1. Schmidt, M. (1903) Grundlagen einer Algenflora der Lüneburger Heide. Inaugural-Dissertation zur Erlangung der Doktorwürde der Philosophischen Fakultät der Georg-August-Universität zu Göttingen.
Van Westen, M. & Coesel, P. (2012) Penium amplificatum status nova (Desmidiales, Streptophyta).

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