NEMASTOMATACEAE, Schmitz, 1892

de Clerck, Olivier, Coppejans, Eric, Schils, Tom, Verbruggen, Heroen, Leliaert, Frederik, de Vriese, Thomas & Marie, Daniel, 2004, The marine red algae of Rodrigues (Mauritius, Indian Ocean), Journal of Natural History 38 (23), pp. 3021-3057 : 3033-3034

NEMASTOMATACEAE Predaea de Toni * Predaea feldmannii Børgesen, 1950b: 7 , figures 1–3 References: Kraft and John, 1976: 337–343, figures 10–31; Littler and Littler, 2000: 82, figure p. 83.

Type locality. St Helena.

Vouchers. HEC 14871 (zF) and HEC 14872 (zF), 1 October 2001, Totor (s.s. 9) .

Ecology. On coral head surrounded by extremely silty bottom, 210 m.

Indian Ocean distribution. India ( P. feldmannii var. indica Balakrishnan and Chawla ), Rodrigues (this paper).

Note. Diagnostic characters of P. feldmannii include the subcylindrical, dichotomously branched thallus, the absence of gland cells, the three-celled carpogonial branch, the large amount of nutritive cells and the gonimoblast which arises from a connecting filament ( Kajimura, 1995).

Platoma Schmitz

* Platoma cyclocolpa (Montagne) Schmitz, 1889: 453

( figure 3 )

References: Masuda and Guiry, 1994: 191–209, figures 1 –34; Huisman, 2000: 84; Littler and Littler, 2000: 92, figure p. 93.

Type locality. Gran Canaria , Canary Islands ( Masuda and Guiry, 1994). Vouchers. HEC 14857, 20 September 2001, HEC 14711 (zF), 29 September

2001 and HEC 14874, 1 October 2001, Totor (s.s. 9) ; HEC 14797, 25 September

2001, Grand Baie (s.s. 11); HEC 14805, 26 September 2001, Chaland (s.s. 8) .

Ecology. On coral fragments on the sometimes silty reef slope between 7 and

15 m depth, locally abundant.

Indian Ocean distribution. West Australia, Rodrigues (this paper).

Titanophora (J. Agardh) J. Feldmann

* Titanophora pikeana (Dickie) J. Feldmann, 1942: 111

( figure 4 ) References: Mshigeni and Papenfuss, 1980: 780–788, figures 1, 3 –20; Norris, 1992:

5–8, figures 11–19; Abbott, 1999: 169, figure 41C; Kraft et al., 1999: 12,

figures 17–19 (as T. weberae ); Huisman, 2000: 86 (as T. weberae ); Payri

et al., 2000: 216, figures pp. 216–217 (as T. weberae ); Schils and Coppejans,

2002: 261–265, figures 36–44; Littler and Littler, 2003: 88, top and middle

figures p. 89.

Type locality. Mauritius .

Vouchers. HEC 14844, 29 September 2001, Grand Paté (s.s. 7) ; HEC 14875, 1 October 2001, Totor (s.s. 9) .

Ecology. Epilithic on pebbles and coral fragments in gulleys between coral heads, or between branches of acroporid corals, between 5 and 15 m depth.

Indian Ocean distribution. Madagascar, Mauritius ( Børgesen, 1943: 31–36, figures 10–12, pl. 1, figures 1, 2 ; 1949b: 2–3, figure 1 ; 1950a: 12), Réunion ( Payri, 1985: 640), Rodrigues (this paper), South Africa, Sri Lanka.

Note. We follow R. Norris (1992: 8) and Schils and Coppejans (2002: 261–265) in the opinion that T. pikeana and T. weberae Børgesen are both growth forms of the same species.

Figures

FIGS 1–7. Rhodophytes. (1) Gracilaria corticata (HEC 14627). (2) Renouxia antillana (HEC 14804). (3) Platoma cyclocolpa (HEC 14805). (4) Titanophora pikeana (HEC 14875). (5, 6) Cryptonemia crenulata (HEC 14876): (5) general morphology; (6) serrate margin. (7) Cryptonemia crenulata (HEC 15134b): cross-section showing cortex and medulla with densely stained ganglionic cells. Scale bars: 1 cm (1, 3, 4); 2 cm (2, 5); 5 mm (6); 50 Mm (7).