Vascular spore plants bear their spores in specialized structures. These are often tucked under leaves (sometimes modified leaves). They range from the familiar spore sacks that line the bottom of fern leaves, to specialized end-of-shoot structures called strobilli in club mosses and horsetails, to spherical sacs that line the edges of leaves in Adders Tongues.
Phylum: Tracheophyta Classes: Lycopodiopsida and Polypodiopsida
art from the Biodiversity Heritage Library
Aka Firmoss, they are creeping plants that have whorls of needles like fir trees. Spores are born at the base of some leaves. They may be at the end of the shoot (the club), or be in the middle of a branch.
Class: Lycopodiopsida Order: Lycopodiaceae
Photo from iNaturalist
Strongly ranked leaves forming flat sprays, or awl shaped leaves similar to clubmoss. Spores born in sacs between leaf and branch. Dichotomously branching (each branch forks into exactly two paths).
Class: Lycopodiopsida Order: Selaginellales
art from the Biodiversity Heritage Library
Aquatic or semi aquatic, and rarely more than 8 inches tall. Spores born in hollows at leaf base.
Class: Lycopodiopsida Order: Isoetales
art from the Biodiversity Heritage Library
Small green plants with various leaf shapes. All with a stalk that bears many spore sacs.
Class: Polypodiopsida Subclass: Ophioglossidae
art from the Biodiversity Heritage Library
A hollow ridged stem that may bear whorls of branches at nodes. Both stem and branches are photosynthetic (and green), tiny leaves look like little black needles at each node of the stem. Spores born in strobili (club like structure) at the end of some (not all) stems.
Class: Polypodiopsida Subclass: Equisetidae
art from the Biodiversity Heritage Library
Ferns come in many different shapes and sizes, but most have compound pinnate or multi-pinnate leaves (fronds) that attach to a running buried rhizome. Spore sacs are born under the leaves. New growth emerges as fiddle heads.
Class: Polypodiopsida Subclasses: Polypodiidae and Marattiidae