The concept of the pteridosperms goes back to the late 19th century when palaeobotanists came to realize that many Carboniferous fossils resembling fern fronds had anatomical features more reminiscent of the modern-day seed plants , the cycads .
The concept of the pteridosperms goes back to the late 19th century when palaeobotanists came to realize that many Carboniferous fossils resembling fern fronds had anatomical features like cycads .