Which of the following plant classifications is characterized by the presence of a vascular tissue, but not seeds?

Pteridophytes have a well-developed vascular system and naked embryos called spores. The reproductive organs are very inconspicuous (not visible) and therefore, are called “cryptogamae” or “those with hidden reproductive organs”. Therefore, no formation of seed occurs. Thallophytes and bryophytes are also known as cryptogams, e.g. fern.