Spongites yendoi is a species of crustose red seaweed with a hard, calcareous skeleton in the family Corallinaceae.

Its range includes South Africa, Réunion, the Comoroes, Mayotte and Mauritius, and extends to China, Indonesia and Australia.

[7] On the rocky coasts of South Africa, Spongites yendoi is the main algal component of a community of organisms commonly found in the low intertidal zone.

Twice a year, Spongites yendoi sloughs off its upper layers but nevertheless seaweeds soon grow again on the exposed surface which is usually kept clean by the feeding activities of the herbivores.

It also grows on the shells of Scutellastra argenvillei, Patella granatina, Oxystele sinensis and Turbo spp., and around the colonial mollusc Dendropoma corallinaceum.