The cytology of Audouinella hermannii (Rhodophyta, Florideophyceae). I. Vegetative and hair cells

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Abstract
A cytological study was conducted on the freshwater red alga A. hermannii (Roth) Duby (Acrochaetiales) from the North Alouette River, British Columbia [Canada]. Cell division and elongation occurred exclusively in apical cells of the primary axis, branches, and branchlets; new cell wall material was produced at the tip of the cells. Six chromosomes were counted in vegetative cells. The fine structure of vegetative cells was similar to that of the few other florideophycean algae studied to date. Ultrastructure of apoplastic hair cell development was recorded for the 1st time in the Rhodophyta. Mature hair cells were long and characterized by a thin wall, a large proximal vacuole and cytoplasm concentrated at the distal end containing a large central nucleus, active dictyosomes, and an abundance of endoplasmic reticulum and mitochondria.