环带横列于孢子囊的上部，完全，单排细胞，细胞数目约为18个。

The indusium is absent. The annulus is transverse and complete, and consists of about 18 thickened cells.

youdao

环带横列于孢子囊的上部，完全，单排细胞，细胞数目约为18个。

The indusium is absent. The annulus is transverse and complete, and consists of about 18 thickened cells.

youdao