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Plakortis spp
Brown or reddish brown sponges, with colonies rarely greater than 30 cm across. Exhalent pores are few, fairly large and conspicuous or raised on an otherwise featureless skin. Many have a flowing or dripping shape, though all are cushion-shaped, soft, and commonly known as ’chicken liver’ sponges:

There are several species:
P. angulospiculatus: dark brown to grey, small oscules and small spicules.
P. halichondroides: black, exuding a dark ink, large oscules.
P. sp, as P. halichondroides but wigher brown and without the dark ink.
P. ziggompha, green, small oscules and small spicules.
(P. simplex is a commonly used name but is a synonym.)