limminghei from Bermuda do not group with the type of the genus, K. reniformis (Turner) J. Agardh, rather they solidly align with the Meredithia/Psaromenia grouping in our trees

(Figs. 1 and 2). Alongside the molecular analyses, a comparative morphological study of the generitype M. microphylla demonstrates that our Bermudian collections are best placed as a new species in the “monotypic,” but as will be demonstrated below, highly speciose genus Meredithia: Meredithia crenata C.W. Schneid., G.W. Saunders et C.E. Lane sp. nov. (Figs. 4, A–K and 5, A–C) Description: Gametophytes decumbent, spreading to 6 cm at maturity, arising from short, simple to branched stipes on the lower surface (Fig. 4A), the stipes central to submarginal, occasional secondary stipes forming from margins or blades (Fig. 4G). Blades initially elliptical Adriamycin to reniform PD 332991 with smooth margins to 1.5 cm in diam., early on becoming highly crenate (Fig. 4, A, D and E); some terminal crenations first developing as finger-like projections on margins (Fig. 4F), later elongating into flattened blades (Fig. 4,

B and C), at maturity these reaching 0.5 cm diam. and 300 μm thick, the margins mostly remaining crenate. Cortex composed of four to five layers of pigmented cortical cells diminishing in size from the medulla to the outer cortex (Fig. 4H), 2–5 μm diam. in surface view (Fig. 4J), connecting to a nonpigmented, intertwining, finely filamentous medulla with cells to 1.5 μm diam. (Fig. 4, H and I) and occasional large stellate ganglion cells (Fig. 4K). Gametophytes monoecious, female supporting cells bearing a 3-celled carpogonial branch and 1-many subsidiary cells (Fig. 5A). Cystocarps to 400 μm in diam., producing a tight mass of small carpospores to 3 μm (Fig. 5B). Spermatangia to 2 μm diam. in scattered irregular sori on both blade surfaces (Fig. 5C). Tetrasporophytes unknown. Type collection: GWS001247 (=C.W. Schneider (CWS)/C.E. Lane (CEL) 01-14-8), fertile, November 12, 2001, Walsingham Pond, Bermuda I., Bermuda, western Atlantic Ocean, 32°20′ 48.2″ N, 64°42′ 40.9″ W, from 5 m on a shaded vertical ledge at the western end of the salt pond. Holotype, UNB [GWS001247, coll. G.W. Saunders,

GenBank LSU rDNA AY171612, BOLD selleck inhibitor COI-5P ABMMC547-06] (Fig. 4B). Isotypes [CWS/CEL 01-14-8]: GALW, MICH, NY, UNB, US, and Herb. CWS (Fig. 4C). Additional collections (Paratypes): Bermuda—CWS/CEL 01-22-13, fertile, November 16, 2001, Walsingham Pond, loc. cit., 6 m [additional collection as GWS001258]; CWS/CEL 02-9-22, fertile, April 15, 2002, Walsingham Pond, loc. cit., 2–4 m; CWS/CEL 03-11-9, March 29, 2003, Governor’s Landing, Blackwatch Pass Park, Bermuda I., 32°18′ 22.3″ N, 64°47′ 00.2″ W, 3 m; CWS/CEL 03-16-3, March 31, 2003, Walsingham Pond, loc. cit. 5 m (Fig. 4A); CWS/CEL 03-28-6, April 3, 2003, ledge vic. Tucker’s Town public dock, 32°19′ 59.8″ N, 64°41′34.0″ W, 6–7 m; CWS 05-18-9, July 21, 2005, Idwal Hughes Pond, Walsingham Park, 32°20′ 46.9″ N, 64°42′ 36.