Table S1. Details of collections examinedin this study. S= Subtidal; ND= No Data. Sequence ID separates each specimen in a collection/herbarium number with multiple specimens.

Species / Herbarium Voucher ID / Sequence ID / Collector / Collection date / Locality / Habitat / rbcL GenBank number / psbA GenBank number
Lithophyllum kaiseri / Isolectotype
NY 0045463 / - / ND / ND / Egypt, El Tor (Gulf of Suez) / Subtidal / KX020467 / -
Holotype collection
of L. congestum
TRH A23-1381 in US
TRH A23-1381
TRH A23-1381 / S8 S13 S15 / Goes / 1867 / Caribbean Antilles, St. Barthelemy / ND / KX020468 KX020469 KX020470 / -
Holotype collection of L. daedaleum
NY 00945458 / - / M.A. Howe
no. 2676 / 29-Jun-1903 / Puerto Rico, Salinas Bay. / epilithic exposed
low intertidal / KX020471 / -
US 169407 / - / W.H. Adey / 12-Jan-1973 / St. Croix , Lamb cove, East of the Island. / Subtidal, to 3 m depth / - / KX020446
US 170945 / S38 / W.H. Adey / 17-Oct-1972 / St. Croix, East Point / Subtidal, to 3 m depth / KX020473 / KX020449
US 170945 / S35 / W.H. Adey / 17-Oct-1972 / St. Croix, East Point. / Subtidal, to 3 m depth / KX020472 / KX020447
US 170945 / S61 / W.H. Adey / 17-Oct-1972 / St. Croix , East Point / Subtidal, to 3 m depth / - / KX020460
US 170944 / - / W.H. Adey / 17-Oct-1972 / St. Croix, East Point / Subtidal, to 3 m depth / - / KX020448
US 169405 / - / W.H. Adey / 29-Dec-1972 / St. Croix, Mt. Fancy Point / Subtidal, to 3 m depth / KX020474 / -
US 169408 / - / W.H. Adey / 10-Feb-1966 / Jamaica, South Port Royal / Subtidal, to 3 m depth / KX020475 / KX020456
US 169411 / S51 / Kuhlmann / Jul-1966 / Cuba, Km 14, road between Matanzas and Varadero / Subtidal, to 3 m depth / KX020476 / KX020458
US 169411 / S52 / Kuhlmann / Jul-1966 / Cuba: Km 14, road between Matanzas and Varadero / Subtidal, to 3 m depth / KX020477 / KX020459
US 170947 / - / W.H. Adey / 10 Nov 1974 / Martinique, Pinsonelle algal ridge / Subtidal, to 3 m depth / - / KX020461
US 169409 / - / R. Steneck / May-1978 / Australia, Queensland, One Tree Island / Subtidal / - / KX020462
US 169410 / - / R. Steneck / May-1978 / Australia, Queensland, One Tree Island / Subtidal / - / KX020463
NCU 607187 / - / W. Schmidt, D. Gabriel & T. Sauvage / 9-May-2012 / Egypt, Nabq, Sharm el Sheikh / Subtidal, to 7 m depth / KX020478 / -
NCU 636554 / - / W. Schmidt, D. Gabriel & T. Sauvage / 9-May-2012 / Egypt: Nabq, Sharm el Sheikh / KX020479 / -
PC0165991 / - / L. Le Gall / May-2010 / Madagascar, Toliara province / Subtidal / - / KX020445
Lithophyllum neocongestum sp. nov. / Holotype US 223011 / B. Wysor / 6-Aug-2010 / Panama, Bocas del Toro, off Shark Hole Point, Peninsula Valiente / Subtidal, to 2 m depth / KX020484 / KX020466
Isotype NCU 598862 / B. Wysor / 6-Aug-2010 / Panama, Bocas del Toro, off Shark Hole Point, Peninsula Valiente / Subtidal, to 2 m depth / KX020485 / -
US 169412 / R. Burke / May 1977 / Barbados / Subtidal / KX020486 / KX020457
US 170968 / N. Robinson, J.J. Hernandez-Kantun / 10-May-2012 / Panama, Bocas del Toro, Flat Rock Beach / Subtidal, 3-5 m depth / - / KX020440
US 170967 / N. Robinson, J.J. Hernandez-Kantun / 12-May-2012 / Panama, Bocas del Toro, Sand Fly Bay / Subtidal, to 2-3 m depth / - / KX020441
Lithophyllum platyphyllum / Holotype TRH A23-1401 / P.T. Cleve / No date / St. Martin, Guadeloupe, Caribbean Antilles / No data / KX020481 / -
US 170946 / S46 / W.H. Adey / 29-Oct-1972 / St Croix, Great Pond Bay, Milford Point. / Subtidal, to 3 m depth / KX020482 / KX020455
US 170946 / S43 / W.H. Adey / 29-Oct-1972 / St Croix, Great Pond Bay, Milford Point. / Subtidal, to 3 m depth / - / KX020452
US 170946 / S44 / W.H. Adey / 29-Oct-1972 / St Croix, Great Pond Bay, Milford Point. / Subtidal, to 3 m depth / KX020483 / KX020453
Lithophyllum pseudoplatyphyllum sp. nov. / Holotype US 170943 / - / W.H. Adey / 21-July-1972 / St Croix, East Point / Subtidal, to 3 m depth / KX020480 / KX020454
US 169406 / S40 / W.H. Adey / 28-Dec-1972 / St Croix, Robin Bay, robin Point. / Subtidal, to 3 m depth / - / KX020450
US 169406 / S41 / W.H. Adey / 28-Dec-1972 / St Croix, Robin Bay, robin Point. / Subtidal, to 3 m depth / - / KX020451
Lithophyllum stictaeforme / US 170969 / - / J.J. Hernandez-Kantun / 12-Sep-2011 / Greece, Voula, Voula Beach / Subtidal, to 2.5 m depth / - / KX020442
TSB - LTP complex 1b / - / L. Pezzolesi / 9-Jun-2014 / Italy, Sciusciaù, Gallinara Island, Alassio / Subtidal, 30 m depth / - / KX020443
TSB - LTP complex 11e / - / ND / 4-June-2013 / Italy, Tremiti Islands / Subtidal / - / KX020465
TSB - LTP complex 12d / - / S. Kaleb / 5-October-2013 / Italy, Trezza Bardelli, Gulf of Trieste / Subtidal, 21 m depth / - / KX020444
TSB - LTP complex 4c / - / L. Pezzolesi / 22-May-2014 / Italy, Tavolara Island, Sardinia / Subtidal, from 15 to 20 m depth / - / KX020464