Some green algae exhibit alternation of generations. All land plants exhibit alternation of generations. No charophytes exhibit alternation of generations. Keeping in mind the recent evidence from molecular systematics, the correct interpretation of these observations is that

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The observation that some green algae exhibit alternation of generations and that all land plants exhibit alternation of generations suggests that plants evolved alternation of generations from a common ancestor with green algae. However, the fact that no charophytes exhibit alternation of generations suggests that this was not a trait present in the common ancestor of all green algae and land plants, but rather evolved independently in the lineage leading to land plants.

Some Green Algae Exhibit Alternation of Generations