Ulva pertusa Kjellman, 1897: 4–7

Coppejans, Eric, Leliaert, Frederik, Verbruggen, Heroen, de Clerck, Olivier, Schils, Tom, de Vriese, Thomas & Marie, Daniel, 2004, The marine green and brown algae of Rodrigues (Mauritius, Indian Ocean), Journal of Natural History 38 (23), pp. 2959-3020 : 2966

* Ulva pertusa Kjellman, 1897: 4–7 , pl. 1, pl. 3, figures 1–8

References: Jaasund, 1976: 3; Tseng, 1984: 258, pl. 128, figure 2 .

Syntype localities. Various in Japan .

Vouchers. HEC 14677 (zF), 20 September 2001, Rivière Banane (s.s. 12) ; HEC 14883, 3 October 2001, western part of Cotton Bay (s.s. 13).

Ecology. Epilithic in the intertidal (HEC 14667) and on coral debris on sand about mean low tide (HEC 14883).

Distribution. Indonesia (Sumba), Kenya, Mauritius ( Jagtap, 1993: table I), Rodrigues (this paper), Singapore, Tanzania, Yemen.

Note. Typical for this species are the irregularly placed small perforations of different sizes. Other species with perforations are U. reticulata Forsskål (more or less strap-shaped with numerous large perforations of mixed diameter, up to the blade margin), U. pulchra Jaasund with perforations limited to the central part of the orbicular blade, becoming gradually smaller towards the margin of the perforated part) and U. fenestrata Postels and Ruprecht , described from Siberia but mentioned from the Indian Ocean by Durairatnam (1961: 17, pl. 1, figure 2 , pl. 21, figure 1 ). The latter species is irregularly perforated and the perforations are crenulate.

Figures

FIG. 1. Sampling stations. See table 1 for a list of the stations and their GPS coordinates. Map redrawn from Wells (1988). The outer grey line represents the fringing reef.

FIGS 2–6. Chlorophyta. (2) Microdictyon tenuius, detail of branching and anastomosing patterns (HEC 14849). (3) Bryopsis pennata var. pennata, branchlets of last order contiguous and in a single plane (HEC 14796 p.p.). (4) Bryopsis pennata var. leprieurii, branchlets of last order interrupted and in a single plane (HEC 14757).(5) Bryopsis pennata var. secunda, branchlets of last order curved in one direction (HEC 14796 p.p.). (6) Chamaedoris delphinii (HEC 14617). Scale bars: 250 mm (2); 5 mm (3–5); 1 cm (6).

FIGS 7–13. Caulerpa brachypus, variation in the general morphology and margin structure of the assimilators. (7) Large growth form collected in grooves between bumps of coral rubble, frequently branching and with secondary stolons (HEC 14867). (8) Intermediately large growth form with wide assimilators (HEC 14769). (9) Intermediately large growth form with relatively narrow assimilators (HEC 14656a). (10) Typical specimen with simple or scarcely branched assimilators (HEC 14612). (11) Assimilator with smooth margin (HEC 14612). (12) Assimilator with coarsely dentate margin (HEC 14656a). (13) Assimilator with densely dentate margin (HEC 14718). Scale bars: 2 cm (7–10); 1 mm (11–13).