Key to the common species of Antithamnion

Note: If your specimens don't show gland cells touching two vegetative cells, refer to Antithamnionella

1 Erect axes with opposite laterals, unilaterally branched A. percurrens Dawson
1 Erect axes with alternate laterals 2
2 Branchlets at each node (=whorl branchlets) developing unequally, one of them usually unbranched A. antillanum Børgesen
2 Branchlets at each node developing nearly equally A. ogdeniae Abbott

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