SEBDENIA 163 
firm (1-2 и thick), the cells polygonal and 5-8.5 и in maximum 
diameter in surface view, with narrow very sharply defined 
limiting walls;.cystocarps minute, immersed, slightly or not at all 
protuberant, the spore-masses subglobose, 55-85 и in diameter, 
provided with a moderately well-developed involucre (pericarp). 
"Lima (v. s. in herb. Binder)." Not collected by Dr. Coker. 
This, like the preceding species, has been known only from the 
brief description and very good figures published by Kützing, and 
has been mentioned by succeeding writers among “species in- 
quirendae." The species, it seems, is no longer to be found in 
herb. Binder, but the evident type, figured by Kützing, is in the 
Kützing herbarium, now owned by Madame Weber-van Bosse of 
Eerbeek, Holland. Тһе thin, firm, very clearly defined limiting 
walls of the epidermal cells are a striking characteristic of the 
species. Grateloupia Cutleriae, of identity or affinity with which 
the species has been suspected, has a very different cortex. 
Sebdenia heteronema sp. nov. 
Plane, membranaceous, scarcely gelatinous, up to 30 cm. long, 
irregularly and subpalmately divided, the main segments mostly 
elliptic-oblong with broad, obtuse, retuse, or sometimes lobed or 
lacerate apices, the margins and both surfaces bearing numerous 
obcordate, obovate, suborbicular, or subreniform, short-stipitate 
or subsessile foliolar innovations 0.5-2.5 cm. in diameter, the 
angular-orbicular and 4-11 и in diameter in surface view, with 
limiting walls indistinctly defined; tetrasporangia 19-28 и X 8- 
13 и, the spores decussately paired. [PLATE 58.) 
