Subdivisions of this type of plant include the cycads and one that one has one living species, biloba.
Extinct groups of this type of plant include the class Cordaitopsida and the division Bennetitophyta. Characterized by the presence of mega- and micro-strobili, members of this group can have up to twenty cotyledons. Pollen grains from these plants typically have more than two cells and land directly on the ovule, which only has one integument. Subdivisions of this type of plant include the cycads and one that one has one living species, biloba. For 10 points, name this type of seed plant that include gingkos and conifers, whose name means "naked seed" and is often contrasted with the angiosperms.
Extinct groups of this type of plant include the class Cordaitopsida and the division Bennetitophyta.
{gymnosperms}