Transfusion tissue is unique to the area surrounding leaf veins in this group of plants, and (*) rhyÂ·tiÂ·dome is a tissue layer that forms exterior to the periderm in this group of plants.
The "living fossil" Welwitschia mirabilis is a member of this group of plants endemic to the Namib desert. Elkinsia polymorpha is another member of this group of plants believed to date from the late Devonian era that was discovered in deposits from its namesake town in eastern West Virginia. Albuminous cells, also known as Strasburger cells are unique to the secondary phloem of this group of plants. Transfusion tissue is unique to the area surrounding leaf veins in this group of plants, and (*) rhyÂ·tiÂ·dome is a tissue layer that forms exterior to the periderm in this group of plants. This group of plants lacks vessel elements, and only possesses tracheids in its xylem. Members of this group of plants include cycads, ginkgos, and conifers. For 10 points, name this group of plants without true fruits or flowers, and whose seeds develop on an open surface. 
The "living fossil" Welwitschia mirabilis is a member of this group of plants endemic to the Namib desert.
gymnosperms [prompt on "flowerless plants/hardwoods/trees," prompt on "cupulate plants," prompt on "seed ferns"] 