Ulva meridionalis R.Horimoto & S.Shimada, 2011

Ng, Yu Fei & Huang, Danwei, 2024, Species diversity and phylogeny of the green macroalga Ulva (Ulvophyceae, Chlorophyta) in Singapore, Phytotaxa 662 (1), pp. 67-79 : 72

publication ID

https://doi.org/ 10.11646/phytotaxa.662.1.5

DOI

https://doi.org/10.5281/zenodo.14516506

persistent identifier

https://treatment.plazi.org/id/03E087B2-FFF6-FFAE-15E3-FC0DFAAEFB5A

treatment provided by

Felipe

scientific name

Ulva meridionalis R.Horimoto & S.Shimada
status

 

Ulva meridionalis R.Horimoto & S.Shimada in Horimoto et al. (2011: 161)

Material examined:— SINGAPORE. Pulau Ubin: Chek Jawa, 17 July 2022, NYF220716 , NYF220717 , NYF220718 , NYF220719 , NYF229720 , NYF220722 , NYF220725 ( SING) ; East Coast : East Coast Park Carpark G, 18 July 2022, NYF220742 ( SING) ; Sentosa : Tanjong Rimau, 23 August 2022, NYF220805 , NYF220807 ( SING) ; Pulau Hantu , 14 August 2022, NYF220832 ( SING) .

Description:—Thallus in the shape of tubular filaments, smooth or wrinkled ( Figs. 4C–F, 4H View FIGURE 4 ). Thallus width decreases towards the base ( Fig. 4G View FIGURE 4 ). Second-order branching restricted to the thallus base. Some thalli have one to multiple transverse constrictions ( Fig. 4I View FIGURE 4 ). Thallus filaments are 0.6–19.5 cm in length; apex/median of filament are 3–100 mm in width (n = 6); base of filament are 60–472 μm in width (n = 6). Surface cells are mostly cuboidal, polygonal, or irregular. Cells in surface view are 6–15 μm in length and 5–11 μm in width (n = 20). In surface view, chloroplast covers the periphery of cell with 1 to 3 pyrenoids ( Fig. 4J View FIGURE 4 ). In transverse sections, thallus 28–33 μm in width (n = 5), cell shape is rectangular, 20–23 μm in length and 13–17 μm in width (n = 6), with parietal chloroplast ( Fig. 4L View FIGURE 4 ).

Distribution in Singapore:—Chek Jawa, East Coast Park Carpark G, Tanjong Rimau, and Pulau Hantu.

Habitat:—Anchors onto sand, in between pebbles, or on rocks ( Figs. 4A–B View FIGURE 4 ).

Remarks:—New species record for Singapore. Ulva meridionalis has similar gross morphology to the previously recorded U. compressa , U. flexuosa and U. intestinalis due to its filamentous thalli. There was generally strong support for the Ulva meridionalis clade in the tuf A, ITS and rbc L trees ( Fig. 2 View FIGURE 2 ; Supplementary Files 3, 4). The Vietnamese Ulva spp. 3 and 4 ( Tran et al. 2023) are closely related to U. meridionalis . However, they can be distinguished from U. meridionalis because there are no pyrenoids in Ulva sp. 3 and 3–6 pyrenoids in Ulva sp. 4 ( Tran et al. 2023).

SING

Singapore Botanic Gardens

G

Conservatoire et Jardin botaniques de la Ville de Genève

A

Harvard University - Arnold Arboretum

L

Nationaal Herbarium Nederland, Leiden University branch

Kingdom

Plantae

Phylum

Chlorophyta

Class

Ulvophyceae

Order

Ulvales

Family

Ulvaceae

Genus

Ulva

Loc

Ulva meridionalis R.Horimoto & S.Shimada

Ng, Yu Fei & Huang, Danwei 2024
2024
Loc

Ulva meridionalis R.Horimoto & S.Shimada

Horimoto, R. & Masakiyo, Y. & Ichihara, K. & Shimada, S. 2011: 161
2011
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