cit., 2–4 m; CWS/CEL 09-9-9, March 16, 2009, Walsingham Pond, loc. cit., 2–4 m; CWS/CEL/T.R. Popolizio 12-3-12, January 16, 2012, Walsingham Pond, loc. cit., 2–3 m. Etymology: crenata (L, f.), for the crenate development of frond margins. Misapplied name for Bermuda: K. limminghei Mont. sensu

W.R. Taylor 1960, p. 432, pl. 80, fig. 2. Distribution: Endemic to Bermuda, western Atlantic. Remarks: Meredithia crenata represents an addition to the growing list of taxa with type localities in Walsingham Pond, one of Bermuda’s inland national treasures (Schneider and Lane 2005, 2007, 2008, Schneider et al. 2006). Our Bermuda specimens share many features — morphological, reproductive, and ecological — with the generitype and, until now, the only species of Meredithia, M. microphylla (Codomier 1973, as K. microphylla J. Agardh; Irvine 1983, as K. microphylla; Guiry and Maggs 1984).

The early growth form of the reniform blades of M. crenata are reminiscent PF-01367338 mouse of M. microphylla. As the blades of M. crenata produce finger-like projections that ultimately develop into strap-shaped blades, the similarity is lost. Both species, however, share a number of characteristics, including semipeltate and relatively thick blades, branched stipes, and marginally produced stalks that develop new blades. Guiry and Maggs (1984) noted that the rigid, semipeltate blades of M. microphylla grow “on rock overhangs in subtidal depths of 1.5–30 m” throughout its eastern Atlantic range, and Alongi et al. (2012) recently GDC-0068 reported M. microphylla as one of the macrophytes found in a 17 m deep submarine cave off Lampedusa Island, Italy. Similarly, M. crenata is invariably found in shaded, vertical habitats in Bermuda such as inland cave-fed salt ponds, rock chasms, and on deeper offshore reefs. Very few of our collections of Meredithia crenata have been Oxymatrine found to contain fertile gametophytes (late fall to spring only), and they are monoecious with irregular spermatangial sori scattered over both surfaces of the blades (Fig. 5C). In their widespread

collections of gametophytes of M. microphylla from Britain and Ireland, Guiry and Maggs (1984) only found a single plant bearing spermatangia. This finding suggests that the species has dioecious gametophytes (Table 2). Single carpogonial branches of M. crenata are borne on supporting cells of the inner cortex and consist of three cells per branch (Fig. 5A). Trichogynes reach the outer surface between cortical cells but we have not observed any that penetrated to the environment beyond the cortex, similar to those in M. microphylla (Guiry and Maggs 1984). The same supporting cell cuts off one to many sterile subsidiary cells as typical of the genus, and these obscure the carpogonial branches by their irregular form and larger size at maturity. Auxiliary cell branches have not been found. Cystocarps develop internally into the medullary region (Fig.