taxonID	type	description	language	source
2E7A8796CC55CA5DDFD3B5B5FE1BF852.taxon	materials_examined	Type: — SRI LANKA. Jaffna District, Kankasanthurai, April 1929, E. C. T. Holsinger C-A- 100359 (holotype C!)	en	Deshaprema, Supun, Dissanayake, Sachini (2025): Acetabularia monodisca, comb. et stat. nov. (Polyphysaceae): A taxonomic reclassification of an umbrella alga from Jaffna, Sri Lanka, with a key to Acetabularia species in the Indian Subcontinent. Phytotaxa 693 (3): 245-254, DOI: 10.11646/phytotaxa.693.3.5, URL: https://doi.org/10.11646/phytotaxa.693.3.5
2E7A8796CC55CA5DDFD3B5B5FE1BF852.taxon	description	Description: — Thallus 23.5 – 52.4 mm tall, calcified, attached to a substratum, forming dense tufts. Peduncle straight, cylindrical, slightly nodulate, 20.6 – 49.4 mm long, two verticils of sterile hairs or two rings of hair scars visible on peduncles below the disc of the gametangial rays, each peduncle bearing a light-green terminal disc. Disc rigid, less caliciform to planar in shape when mature, 7.3 – 13.5 mm in diameter, 3.5 – 4.9 mm in depth, formed by the lateral fusion of 59 – 86 gametangial rays. Gametangial rays long, cuneiform, and 3.0 – 6.5 mm long with an apiculate apex. The apex of upper corona segments emarginate to round with each segment bearing two hairs. The apex of lower corona segments emarginate. Each fertile gametangial ray bearing 100 – 180 globose to spherical cysts.	en	Deshaprema, Supun, Dissanayake, Sachini (2025): Acetabularia monodisca, comb. et stat. nov. (Polyphysaceae): A taxonomic reclassification of an umbrella alga from Jaffna, Sri Lanka, with a key to Acetabularia species in the Indian Subcontinent. Phytotaxa 693 (3): 245-254, DOI: 10.11646/phytotaxa.693.3.5, URL: https://doi.org/10.11646/phytotaxa.693.3.5
2E7A8796CC55CA5DDFD3B5B5FE1BF852.taxon	distribution	Distribution and ecology: — Restricted to the shallow-intertidal sea next to Mathagal Beach, Kankasanthurai, Jaffna District, Sri Lanka (Figures 5 & 6).	en	Deshaprema, Supun, Dissanayake, Sachini (2025): Acetabularia monodisca, comb. et stat. nov. (Polyphysaceae): A taxonomic reclassification of an umbrella alga from Jaffna, Sri Lanka, with a key to Acetabularia species in the Indian Subcontinent. Phytotaxa 693 (3): 245-254, DOI: 10.11646/phytotaxa.693.3.5, URL: https://doi.org/10.11646/phytotaxa.693.3.5
2E7A8796CC55CA5DDFD3B5B5FE1BF852.taxon	etymology	Etymology: — ‘ Single disc’ (Greek mono = single, disca = disc). The specific epithet is based on the previous variety epithet (var. monodisca). Additional specimens examined: — SRI LANKA. Jaffna District, Kankasanthurai, April 1929, E. C. T. Holsinger, C-A- 100360 (isotype C!); Jaffna District, Kankesanturai, 9 o 47 ’ 3.8 ” N, 79 o 56 ’ 22.6 ” E, 25 May 2023, Supun Deshaprema, WCSG / AL / 001 (PDA!); Jaffna District, Kankesanturai, 9 ° 47 ' 6.7 " N, 79 ° 56 ' 29.7 " E, 25 May 2023, Supun Deshaprema, WCSG / AL / 002 (PDA!); Jaffna District, Kankesanturai, 9 ° 47 ' 10.5 " N, 79 ° 56 ' 34.0 " E, 25 May 2023, Supun Deshaprema, WCSG / AL / 005 (PDA!); Jaffna District, Kankesanturai, 9 ° 47 ' 4.5 " N, 79 ° 56 ' 24.4 " E, 25 May 2023, Supun Deshaprema, WCSG / AL / 007 (PDA!)	en	Deshaprema, Supun, Dissanayake, Sachini (2025): Acetabularia monodisca, comb. et stat. nov. (Polyphysaceae): A taxonomic reclassification of an umbrella alga from Jaffna, Sri Lanka, with a key to Acetabularia species in the Indian Subcontinent. Phytotaxa 693 (3): 245-254, DOI: 10.11646/phytotaxa.693.3.5, URL: https://doi.org/10.11646/phytotaxa.693.3.5
