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b
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Figure 8.14 Life cycles of C. velia (A) and V. brassicaformis (B). Vegetative cell (a, 1) is a
predominant stage in the cultures of both algae. It divides in C. velia (b) into two (c) to
four (e) vegetative cells forming an autosporangium (c, e) bounded by additional mem-
brane. Autospores are released from sporangia (d, e) and start a new life cycle. It appears
that zoospores (f ) can be formed after light exposure from released autospores but
likely also from other stages (not shown). Vegetative cell of V. brassicaformis (1) grows
up to 10 - 30 m m in diameter and forms cell with fine-grained content (2). It develops
either into autosporangium (3) containing dozens of autospores (4) or zoosporangium
with numerous zoospores (5). Both types of spores are released (4, 6), autospores start
the new life cycle. Fate of zoospores is yet unknown. (A) Reprinted from ObornĂ­k et al.
(2011) , Copyright (2011), with permission from Elsevier 2011. (B) Reprinted from ObornĂ­k
et al. (2012) , Copyright (2012), with permission from Elsevier 2011.
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