Now that I know that the grey patches on laminaria fronds are sea mats, I've taken more notice of them. Was quite surprised to see the two most common species growing together. Membranipora membranacea colonies have quite a smooth curbed outline whereas Electra pilosa forms an angular roughly star-shaped colony.
Close up can see the lacy structure. This photo shows quite well the difference between the rectangular shape of the individual cells of Membranipora membranacea on the left and the oval shaped cells of Electra pilosa on the right. (Click to enlarge)
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