Sargassum C. Agardh 1820
Creators: name: Tu, Nguyen Van
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Chromista
Ochrophyta
Phaeophyceae
Fucales
Sargassaceae
Sargassum

description: Key for Sargassum from southwestern Vietnam
1a. Axes with spines.................................................................................................................................................................................2
1b. Axes smooth .......................................................................................................................................................................................3
2a. Holdfasts lobed.................................................................................................................................................................. S. confusum
2b. Holdfasts conical, giving rise to stolon-like branches.................................................................................................... S. polycystum
3a. Axes compressed ................................................................................................................................................................................4
3b. Axes cylindrical..................................................................................................................................................................................6
4a. Leaves with entire margin ................................................................................................................................................... S. swartzii
4b Leaves with serrate margin.................................................................................................................................................................5
5a. Vesicles with terminal spines; petioles compressed or leaf-shaped; leaves thin ........................................................... S. oligocystum
5b. Vesicles on leaves; petioles compressed; leaves thick curved inside branches ..................................................................... S. feldmannii
6a. Leaves with entire or sparse spines, undulate ....................................................................................................................................7
6b. Leaves with sharply serrated margin..................................................................................................................................................8
7a. Basal leaves blunt at the apex; vesicles ovate ................................................................................................................... S. cinereum
7b. Basal leaves thick, larger and oval; vesicles oval or lanceolate ...................................................................................... S. siliquosum
8a. Vesicles spherical to obovate..............................................................................................................................................................9
8b. Vesicles leaf-shaped..........................................................................................................................................................................10
9a. Vesicles numerous; leaves lanceolate........................................................................................................................... S. microcystum
9b. Vesicles few; leaves obovate to spathulate ................................................................................................................................... S. ilicifolium
10a. Leaves serrated; midribs conspicuous up to ¾ of leaves................................................................................................. S. aquifolium
10b. Leaves spathulate to obovate; midribs inconspicuous..................................................................................................................... S. mcclurei
description: Published as part of Tu, Nguyen Van, 2023, Morpho-anatomical study of Sargassum (Fucales, Phaeophyceae) diversity reveals noteworthy collections and range extensions from southwestern Vietnam, pp. 281-290 in Phytotaxa 600 (5) on pages 287-288, DOI: 10.11646/phytotaxa.600.5.3, http://zenodo.org/record/8129374