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 (15[1])that is used as a biofertilizer for rice for its ability to fix nitrogen (-5[2])is named Azolla. (-5[1])The gametophyte (-5[2])stage of these plants (-5[1])is a heart-shaped structure (15[2])called (15[1])the prothallus. (15[2]-5[3])These plants undergo circinate (15[1])vernation, (15[1])in which their crozier-shaped (*) fiddleheads expand. (10[14]-5[1])These plants (10[1])evolved (10[3])to grow in (10[1])low-light conditions (10[1])during their namesake (10[1]-5[1])“great radiation” in (10[1])the late Cretaceous period. (10[1]-5[1])This group of plants (-5[1])includes the Marattiales (10[1]-5[1])and the Equisetales, which are called horsetails. (10[5]-5[1])These plants (10[1])display (10[1])brown dots (10[1])called (10[1])sori (10[1])(“sore-ee”) on their undersides. (10[1])For 10 points, (10[1])name these seedless (10[1])vascular plants (10[1])that reproduce by releasing spores from (10[1])their fronds. (10[4])■END■ (10[7]0[2])