Note to players: Common or scientific name acceptable. These plants are classified by a system named for Ren-Chang Ching. An aquatic genus of these plants that is used as a biofertilizer for rice for its ability to fix nitrogen is named Azolla. The gametophyte (-5[1])stage of these plants is a heart-shaped structure (15[1])called the prothallus. (15[1])These plants undergo circinate vernation, in which their crozier-shaped (*) fiddleheads expand. (10[1])These plants evolved to grow in low-light conditions during their namesake “great radiation” in (10[1])the late Cretaceous period. This group of plants includes the Marattiales and the Equisetales, which are called horsetails. (-5[1])These plants display brown dots called sori (“sore-ee”) on their undersides. (10[1])For 10 points, name these seedless vascular plants that reproduce by releasing spores from their fronds. ■END■ (10[1])