O药室内壁发育异常endothecial cells are abnormal 无纤维状加厚During the maturation of anther,the endothecial cells acquire abnormal or no thickening 26 26 ○药室内壁发育异常 endothecial cells are abnormal 无纤维状加厚 During the maturation of anther, the endothecial cells acquire abnormal or no thickening