Cryptogam

Polystichum setiferum, a fern
Grimmia pulvinata, a moss
Pelvetia canaliculata, a brown alga
Hypholoma fasciculare, a fungus

A cryptogam (scientific name Cryptogamae) is a plant (in the wide sense of the word) or a plant-like organism that reproduces by spores, without flowers or seeds.