I had a fern for 35+ years which was frozen to death in a move.
I've seen it identified it here as asparagus fern, sprengeri, densiflorus, retrofractus, sickle thorn, and meyersii, et al.
What I had, had thorns, no flowers or seeds (ever!), increased in size by itself in a pot, could be divided and transplanted easily, had stems which became as thick as 1/2", had to be trimmed back at about 4' so it would still fit in the house, lived outdoors in summer very happily, and the foliage was very soft when new, but dropped constantly and was sharp enough to stick in your bare foot easily once it turned brown on the floor. Along with dropping constantly, you could actually vacuum the thing to remove the "excess" foliage, turn your back for 30 seconds, and it would have dropped more.
The only reason I need another one is that my husband called it our "marriage fern", and is heartbroken since it died. (Honestly, it was a plant, people. They die, okay? You can't tell him that, though.)
I have searched every book, website, garden/nursery/heirloom plant store, anything and everything you can name. I am begging for help. I don't have anything to trade (black thumb, here) but I will happily pay for one, including shipping and packaging, if somebody can just tell me what I lost, and if they have one.