These nodules are mainly round, ellipse and coralloid in shape, pink and yellow in color, with size ranging from 1 mm to 10 mm. 根瘤颜色以土黄色、白色、浅褐色和粉红色为主，部分为多红色或深揭色。
Cycadophyta (cycads) A phylum of cone-bearing gymnosperms (about 75 living species) with palmlike compound leaves and special CORALLOID ROOTS at or near the ground surface, which contain symbiotic nitrogen-fixing cyanobacteria. 苏铁纲（苏铁类植物）：包含球果的一类裸子植物（现存种大约有75种），它们具有掌状的复叶，在近地面处有特殊的珊瑚状的根，根内含有共生的固氮蓝细菌。
Coralloid roots A type of root regularly produced by cycads, which contains symbiotic nitrogen-fixing cyanobacteria in root nodules, giving the roots a knobbly coral-like appearance. 珊瑚状的根：由苏铁类植物产生的一种类型的根，根瘤中含有共生的固氮蓝细菌，使根形成珊瑚状的有节的形状。
coralloid","coralloides oides oides"," 珊瑚状的"
The Anatomical Observation about the Cell Layer with Blue-green Algae in the Coralloid Root of Cycads 苏铁类珊瑚根内藻胞层的解剖观察
