The central column of sterile tissue in the sporangium of liverworts and mosses.
The central column of sterile tissue in the sporangium of liverworts and mosses.
2蒴轴：苔藓的孢子囊中由不育组织构成的中央柱。
The central column of sterile tissue in the sporangium of liverworts and mosses.
2蒴轴：苔藓的孢子囊中由不育组织构成的中央柱。