Phylogenetic Analysis of the Geographically Disjunct Genus Osmundea Stackhouse (Rhodomelaceae, Rhodophyta)

Lynne McIvor, Christine A. Maggs, Michael D. Guiry, and Max H. Hommersand

Fig. 1. Maximum likelihood tree for rbcL sequences of Osmundea and Laurencia species, rooted with Halopithys incurvus, Lophocladia trichoclados and Chondria dasyphylla. Branch lengths are proportional to the amount of sequence change, and bootstrap values (1000 replicates) for MP (top), NJ (middle) and ML (bottom) are indicated at the nodes.

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Fig. 2. Parsimony tree for rbcL sequences of Osmundea and Laurencia species (the roots pruned) showing character states for the presence (blue) or absence (red) of secondary pit connections (upper tree) and the shape (urn-shaped, blue; cup-shaped, red; trichoblast-type, black) of the spermatangial receptacles (lower tree).

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Table 1. Samples from which rbcL sequences were obtained

Sample Date Location/source Collector GenBank accession number
Chondria californica (Collins) Kylin July 1 1996 Beach Club Reef (La Jolla Shores), San Diego Co., California, USA Miguel Volovsek AY172578
Chondria dasyphylla (Woodward) C. Agardh   Wrightsville Beach, New Hanover Co., North Carolina, USA (Freshwater et al. 1994)   U04021
Chondrophycus papillosus Garbary & J.T. Harper March 12 1997 Content Key, Florida, USA MHH AY172577
Halopithys incurvus (Hudson) Batters June 12 1998 Jersey, Channel Islands F. Bunker AF281882
Laurencia obtusa (Hudson) Lamouroux July 6 1998 Fanad Head, Co. Donegal, Ireland CAM AF281881
Lophocladia trichoclados (C. Agardh) F. Schmitz   Las Galletas, Tenerife, Canary Islands, Spain   AF083380
Osmundea blinksii (Hollenberg & Abbott) Nam 17 July 1996 Greyhound Rock, Año Nuevo, San Mateo Co., California, USA MHH AY172575
Osmundea hybrida (A. P. de Candolle) Nam 7 Nov. 1999 Fanad Head, Co. Donegal, Ireland CAM AF281878
Osmundea osmunda (S. G. Gmelin) Nam 12 Oct. 1999 St John's Point, Co. Donegal, Ireland CAM AF281877
Osmundea pinnatifida (Hudson) Stackhouse 12 Oct. 1999 St John's Point, Co. Donegal, Ireland (Epiphytic on Fucus serratus) CAM AF281876
Osmundea pinnatifida 12 Oct. 1999 St John's Point, Co. Donegal, Ireland CAM AF281875
Osmundea pinnatifida 22 July 1993 seawall, Roscoff, France MHH AY172571
Osmundea ramosissima (Oeder) Athanasiadis 12 Oct. 1999 St John's Point, Co. Donegal, Ireland (epilithic) CAM AF281880
Osmundea spectabilis var. spectabilis (Postels & Ruprecht) Nam 10 July 1996 Cambria, San Luis Obispo Co., California, USA MHH AY172573
Osmundea spectabilis var. spectabilis 2 July 1996 Punta Santo Thomas, Baja California, Mexico. MHH AY172574
Osmundea spectabilis var. diegoensis (Dawson) Nam 7 July 1996 College of the Nazarenes, Point Loma, San Diego Co., California, USA MHH AY172572
Osmundea splendens (Hollenberg) Nam 2 July 1996 Drift, Bahia Colnett, Baja California, Mexico MHH & J. Hughey AY172576
Osmundea truncata (Kützing) Nam & Maggs 11 Nov. 1999 Lough Hyne, Co. Cork, Ireland CAM AF281879