| Sažetak: | A very thin crustose Codium, occurring in the southern part of the Gulf of California and along the tropical Pacific coast of Mexico southward to Panama, Colombia, and the Galapagos Islands, is described as a new species, C. picturatum F.F. Pedroche et P.C. Silva. Its anatomy is very different from that of other crustose species, including C. hubbsii Dawson and C. setchellii Gardner, two members of the C. adhaerens group known from Pacific Mexico. In that group, daughter utricles are produced by budding from parent utricles, resulting in clusters that are easily separated by dissection. In C. picturatum daughter utricles are formed at the end of filaments produced by parent utricles, as in erect, branched thalli, but with most filaments being shortened, some to the point that daughter utricles are borne directly on the parent utricle. The medullary filaments are tortuous and closely branched, so that dissection of the thallus is difficult.
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