Ganonema Fan and Wang

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 : 3025-3026

Ganonema Fan and Wang

* Ganonema farinosum (Lamouroux) Fan and Wang, 1974: 492 References: Jaasund, 1976: 63, figure 126 (as Liagora farinosa Lamouroux ); Tseng, 1984: 52, pl. 29, figure 2 (as G. farinosa ); Abbott, 1999: 77, figure 11A–G; Huisman, 2000: 30; Littler and Littler, 2000: 50, figure p. 51; Huisman, 2002: 823–825, figures 118–123; Littler and Littler, 2003: 58, top figure p. 59.

Type locality. Suez, Egypt .

Voucher. HEC 14631 (zF), 18 September 2001, western side of Cotton Bay (s.s. 13).

Ecology. Epilithic in a shallow pool close to low water mark.

Indian Ocean distribution. Andaman Islands, Australia, Bangladesh, India, Mauritius ( Børgesen, 1942: 36–37; 1949a: 33–35; 1951: 31–32, as Liagora farinosa ), Réunion ( Jadin, 1935: 162, as Liagora elongata Zanardini ), Rodrigues (this paper), Somalia, Tanzania.

Note. Both specimens represent male gametophytes.

Izziella Schils and Huisman

* Izziella orientalis (J. Agardh) Huisman and Schils, 2002: 247 References: Doty, 1978: 33–39, figures 1 –9 (as Izziella abbottiae Doty ); Abbott, 1999: 87, figure 14F–J (as Liagora orientalis J. Agardh ).

Type locality. Sri Lanka .

Vouchers. HEC 14682 (zF), 20 September 2001, Rivière Banane (s.s. 12) ; HEC 14830 (zF), 27 September 2001, Baie de l’Hermitage (s.s. 22) ; HEC 14843 (zF), 29 September 2001, Grand Paté (s.s. 7) .

Ecology. Epilithic in low intertidal rock pools as well as epilithic at 15 m depth.

Indian Ocean distribution. India, Indonesia, Rodrigues (this paper), Seychelles, Sri Lanka.

Note. The genus Izziella has recently been restored as an independent genus by Huisman and Schils (2002), different from Liagora . The species on which Izziella was originally based, I. abbottiae , is presently considered a synonym of I. orientalis .

Liagora Lamouroux

* Liagora ceranoides Lamouroux, 1816: 239 References: Jaasund, 1976: 61, figure 124; Tseng, 1984: 54, pl. 30, figure 2 ; Cribb,

1996: 103, figure p. 102; Abbott, 1999: 84, figure 13I–M; Littler and Littler,

2000: 50, figure p. 51; Payri et al., 2000: 158, figures p. 159; Huisman, 2002:

813–816, figures 93–98; Skelton and South, 2002: 139, figure 3G .

Type locality. St Thomas, Virgin Islands .

Vouchers. HEC 14605, 18 September 2001, western side of Cotton Bay (s.s. 13) ; HEC 14683 (zF) and HEC 14684 (zF), 20 September 2001, Rivière Banane (s.s. 12) ; HEC 14752 (zF), 22 September 2001, Grand Baie (s.s. 11) ; HEC 14831 (zF) , HEC 14832 (zF) and HEC 14833 (zF), 27 September 2001, Baie de l’Hermitage (s.s. 22) ; HEC 14847 (zF) and HEC 14848 (zF), 29 September 2001, Grand Paté (s.s. 7) .

Ecology. Epilithic from low intertidal pools down to 15 m depth.

Indian Ocean distribution. Aldabra Islands, Andaman Islands, Bahrain, Bangladesh, Chagos Archipelago, India, Kenya, Madagascar, Mauritius ( Børgesen, 1942: 28), Mozambique, Nicobar Islands, Réunion ( Jadin, 1935, as L. pulverulenta C. Agardh ; Payri, 1985: 640), Rodrigues (this paper), Seychelles, Sri Lanka, Tanzania.

Trichogloea Kützing

* Trichogloea requienii (Montagne) Kützing, 1847: 54 References: Papenfuss, 1946: 419–437; Børgesen, 1952: 16–21, figures 8, 9, pls I, II;

Magruder and Hunt, 1979: 95, figure 3 p . 94; Cribb, 1996: 117, figure p. 116;

Abbott, 1999: 96, figure 18D–F; Millar et al., 1999: 551, figure 1D ; Huisman,

2000: 35; Littler and Littler, 2000: 56, figure p. 57.

Type locality. Red Sea .

Vouchers. HEC 14604, 18 September 2001, western part of Cotton Bay (s.s. 13) ; HEC 14856 (zF), 28 September 2001, Couzoupa (south-east of Hermitage) .

Ecology. Epilithic on horizontal rock substrate just above low water mark; mainly in pools, but some specimens exposed at low tide; one collection at 22 m.

Indian Ocean distribution. Kenya, Madagascar, Mauritius (Dickie, 1974: 191, as Myriocladia capensis ; Jadin, 1935: 159, as Myriocladia capensis ; Børgesen, 1952: 16–21, figures 8, 9, pls I, II), Rodrigues (this paper).

Note. Børgesen (1942: 17–19, figure 7 ) initially recorded T. requienii from Mauritius. In a later publication ( Børgesen, 1951: 8) he referred his record to the newly described T. jadinii Børgesen , in which he also included the record of T. lubrica by Jadin (1935: 162). According to Abbott (cited in Silva et al., 1996: 130; Abbott, 1999: 95) the type of T. jadinii is representative of T. lubrica . The placement of the antheridia as illustrated for T. jadinii ( Børgesen, 1951: 19, figure 6 ), only occupying subterminal cells of the assimilatory cortical filaments, is however at odds with the condition as described for T. lubrica by Abbott (1999: 95–96). Further research and re-examination of the original Børgesen and Jadin collections is needed, therefore, to confirm the presence of T. lubrica in Mauritius.

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).