Publisher's Synopsis
Excerpt from A Monograph of the British Desmidiaceæ, Vol. 2
Cells of variable size, longer than broad, compressed, deeply constricted in the middle, sinus generally linear (rarely open); semicells commonly truncate-pyramidate, apea' with a median incision of variable depth, sometimes scarcely evident or absent, lateral margins entire, sinuate, or variously lobed, at or near the centre of the semicells with one or more somewhat hemispherical pro tuberances (or tumours) variously disposed vertical view more or less elliptical, with one or more pro tuberances on each side one chloroplast in each semi cell, often irregularly lobed and ridged, with a Single central pyrenoid in the small species, and a number of scattered ones in the large Species.
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