The cavity of the tube is known as spongocoel or paragastric cavity. Each main tube opens to the exterior by an aperture called osculum at the summit. Most species are more complicated, consisting of a confused network of branching tubes from which stand out a few larger erect cylinders bearing an osculum at their summit.įinally, in the most complicated species, the outermost tubes fuse together forming a false surface or pseudoderm leaving a few large openings or pseudo pores so that the sponge appears solid and simulates a higher type of sponge but sections show the network of ascon tubes in the interior.Įach tube of the colony may reach up to 25 mm in height and also produces a number of buds. In the simplest species of Leucosolenia, the colony consists of few simple vase-like, cylindrical individuals each terminating in an osculum and united at their bases by irregular horizontal tubes. The colony of Leucosolenia is whitish yellow in colour.
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