The First Record of the Brown Endophytic Alga Laminariocolax aecidioides (Rosenvinge) AF Peters, 1998 in the Russian Far-Eastern Seas

The brown endophytic alga Laminariocolax aecidioides (Ectocarpales: Chordariaceae) growing in Undaria pinnatifida was found in Ussuriisky Bay (Peter the Great Bay, Sea of Japan) for the first time. This finding is the first record of the species in the Russian Far-Eastern seas. This paper presents the morphological features of L. aecidioides in nature and in a free-living culture, as well as some data on its biology in Peter the Great Bay.