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Family Peniaceae

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Chapter Summary

This chapter discusses the characteristics of family Peniaceae that includes only one genus, Penium Bréb, which is bound to acidic habitats. It also explains the characteristics of Penium cylindrus, Penium exiguum, Penium margaritaceum and Penium polymorphum. Penium cylindrus cells are cylindrical with broadly rounded to truncate apices, mostly with one or two girdle bands. Cell length is 25-60 µm and breadth is 10-15 µm. Penium exiguum cells are more or less cylindrical with a slight but generally clearly visible median constriction. Cells just below their poles are somewhat constricted, giving rise to capitate apices. Penium polymorphum cells are cylindric with rounded apices, 2-3 times longer than broad. Cell wall colourless or brownish coloured, is provided with one or more short girdle bands. Cell wall sculpture consists of densely packed fine, longitudinal striae. Cell length is 45-60 µm, and breadth is 20-30 µm.

Keywords: Peniaceae; Penium cylindrus; Penium exiguum; Penium margaritaceum; Penium polymorphum



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