Tên Khoa học: Psilotopsida
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Tên tiếng Việt: Khuyết lá thông
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Psilotopsida is a class of fern-like plants. As circumscribed by Smith et al. (2006) it contains one Psilotaceae family placed in orders Psilotales. The affinities of these two groups have long been unclear and a close relationship between them has only recently been confirmed through molecular systematic studies. Psilotopsida is the sister-group to all other ferns.