The ____ phylum of seedless vascular plants has about 1,000 known living species, including those in the genera Lycopodium and Selaginella ; the gametophyte of some of these species cannot photosynthesize, and instead use mycorrhizae to obtain nutrients.

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The correct phylum is Lycophyta, which includes genera such as Lycopodium and Selaginella. These plants are seedless vascular plants, and some of their gametophytes rely on mycorrhizae for nutrients, indicating they cannot photosynthesize.

The ____ Phylum of Seedless Vascular Plants Has About 1,000