Massive black to gray sponge with clusters of small ostia (pore sieves)
Look alikes:
Ircinia strobilina
Geodia gibberosa
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith