Single or clustered, thick-walled tapering tubes of up to 35 cm high, 10 cm in diameter, with an apical vent of up to 3.5 cm with an iris type diaphragm (A. lacunosa-close up). The tubes are tapering more strongly towards the base than Aplysina archeri ; often the base is barely 1 cm in diameter. Tube walls deeply intended by irregular meandering grooves or disc-shaped depressions of up to 10 mm deep and wide (A. lacunosa-pitted). Consistency tough and hardly compressible; although there seem to be a hard and a soft form.
Ridges dark green to yellowish-green, valleys and pits yellow-green to yellow. Interior walls have yellow excurrent pores.
Habitat: Marine Species Indentification Portal
This species is known from reef and lagoon localities and from sandy flats between the reefs. Often have sediment, algae and various organisms on the surface."
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