Editor-in-Chief: Dring, Matthew J.
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Liagora tsengii sp. nov. (Liagoraceae, Rhodophyta) is described from St Kitts and Guadeloupe, Lesser Antilles, West Indies. Mature thalli are to 7–10 cm in height, pinkish grey, moderately to heavily calcified, mucilaginous, and dichotomously branched (often with numerous short proliferous lateral branches in older portions). Carpogonial branches are 4–5 celled and borne on the mid- or distal region of a mid-cortical supporting cell. Following presumed fertilization the zygote divides transversely and gonimoblast initials arise laterally from the distal daughter cell. A moderately diffuse gonimoblast is produced, although it does not intermingle with vegetative filaments. The lower gonimoblast cells and distal cells of the carpogonial branch coalesce and form a fusion cell. Post-fertilization sterile filaments arise from the basal cell of the carpogonial branch and occasionally from the supporting cell, and adjacent vegetative cells. Spermatangia are borne in clusters on spermatangial mother cells that arise from apical and subapical cells of assimilatory filaments. The new species differs from those previously included in the genus by its moderately diffuse gonimoblast and by the position of the post-fertilization sterile filaments. The former feature relates the new species to Liagora indica V. Krishn. et Sundararajan. Liagora tsengii differs from that species in the production of post-fertilization filaments from the carpogonial branch.
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