Carpophyllum maschalocarpum, commonly known as the common flapjack, is a brown alga that grows in crevices of rocks at low tide levels.

[1] It is a common alga in New Zealand and is endemic.

[2][3] Carpophyllum maschalocarpum is mid-golden brown in colour and dries black.

[1] This species can be found on the shores of the North Island, South Island, and the Chatham Islands.

[1] Carpophyllum maschalocarpum is found on rocks at low water in pools and channels forming a distinct zone and especially on vertical rock faces on open coasts.