The bladder cells at the leaf margins are oriented horizontally and not elongated.

However the flowers and fruits of G.depressum do not have long stalks and are therefore held closely against the stem.

The top of the seed capsule has very thick, raised valves in a tall dome, which is surrounded by a low inconspicuous rim.

Glottiphyllum depressum has more clearly hooked depressions on its leaves, which are also often slightly more erect.

Here, in the far eastern part of its range, it co-occurs with the species that it also most resembles, its close relative Glottiphyllum grandiflorum.