title: CHUKCHIA PEDICELLATA GEN. ET SP. NOV. AND C. ENDOPHYTICA NOV. COMB., ARCTIC ENDEMIC BROWN ALGAE (PHAEOPHYCEAE)(1).
abstract: Study of the north Alaskan brown algal epiphyte Chukchia pedicellata sp. nov. suggests an apparently close relationship to Phaeostroma. Phaeostroma endophyticum S. Lund from east Greenland, Bylot Island, Nunavut, Canada, shows generic identity with Chukchia and specific differences from C. pedicellata. Comparison of C. pedicellata and P. pustulosum Kuck. (the type species of Phaeostroma) shows morphological, cytological, reproductive, and distributional differences. We recognize novelty of C. pedicellata and necessity to broaden the species description of P. endophyticum, which becomes Chukchia endophytica. C. endophytica is distinguished by its dimorphic vegetative habit, its large plurilocular sporangia, and the putative ability of the sporangia to digest host tissue to accommodate development within the host. Absence of pyrenoids and novel plurilocular sporangia in both species suggests that they are not members of the Ectocarpales, sensu lato.
authors.affiliation: Department of Biology, University of Massachusetts, Amherst, Massachusetts 01003, USABiological Institute, Department of Phycology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkGraduate School of Kuroshio Science, Kochi University, 2-5-1, Akebono, Kochi 780-8520, Japan.
authors.forename: Robert T
authors.initials: RT
authors.lastname: Wilce
authors.affiliation: Department of Biology, University of Massachusetts, Amherst, Massachusetts 01003, USABiological Institute, Department of Phycology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkGraduate School of Kuroshio Science, Kochi University, 2-5-1, Akebono, Kochi 780-8520, Japan.
authors.forename: P M
authors.initials: PM
authors.lastname: Pedersen
authors.affiliation: Department of Biology, University of Massachusetts, Amherst, Massachusetts 01003, USABiological Institute, Department of Phycology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkGraduate School of Kuroshio Science, Kochi University, 2-5-1, Akebono, Kochi 780-8520, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Sekida
keywords: Arctic endemic; Chukchia; Phaeostroma; alginate; brown algal endophyte; cell cleavage; plurilocular sporangium