Morphological description (show/hide)
| thick, erect, lamellate ridge | | light beige in water, dark brown on deck | | beige grey | | apex of ridge appears as continuous sieve-plate containing many small oscules | | tough, compressible, difficult to tear | | opaque, membranous, uneven, conulose, conules prominent, irregular | | fibrous, irregular reticulation of primary and secondary fibres, fibres widely-spaced, fasciculated, mainly obscured by collagen filaments, primary fibres fully cored with large sand detritus, secondary fibres clear, lamination and pith of fibres obscured by collagen filaments, collagen filaments abundant in mesohyl, knobbed | | membranous, with thin crust of detritus arranged in small circular meshes | | nil | | nil |
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