Fu-Floridee, Rhodymenies:, Rhodymenia. 511 
Sectio I. PALMATJE: Species tetrasporangiis per totam superficiem sparsis aut 
1. 
in soros collectis. 
Rhodymenia pertusa (Post.et Rupr.) J. Ag. Sp. IL, p. 376, Epicr. 
p. 929, Kjellm. Algs of the Arctie Sea p. 150, PorpAyra pertusa 
Post. et Rupr. Illustr. Alg. p. 20, t. XXXVI, Kuetz. Sp. p. 693. — 
Fronde a stipite distincto cuneatim dilatata, simpliciuscula, apice 
emarginato-lobata; tetrasporangiis per totam laminam superiorem 
quasi punctatam sparsis. 
Hab. in oceano Arctico ad oras Canciatez:e (Mus. PETROPOLITA- 
NUM), Groenlandiz:e (WonwskzoLp) et Spetsbergie (KJELLMAN) — 
Frons 10-15 cm. longa, et 4,5-9,5 cm. superne lata, a stipite 12- 
14 millim. longo subcartilagineo teretiusculo sensim expansa in 
laminam membranaceam obovato-cuneatam, margine nudam, apice 
late emargiratam demumque lobatam, lobis ovatis sese invicem 
sepe incumbentibus. In nonnullis paullo supra stipitem, h. e. ad 
ortum lamin:s, aurieula minor adest, demum forsan in novam fron- 
dem evolvenda. Color coccineus. Substantia membranacea. 
Rhodymenia peruviana J. Ag. Sp. II, p. 378, Epicr. p. 929. — 
Fronde tenuissima, gelatinoso- membranacea, a stipite distincto cu- 
neatim dilatata, dichotomo-flabellata, margine nuda (aut segmentis 
obsita?); tetrasporangiis in soros haud definitos per superficiem 
sparsos congregatis. 
Hab. ad oras Peruviw meridionalis (BavwE). — Frons semipe- 
dalis, flabellatim expansa, decomposito-dichotoma, segmentis a basi 
angustiore cuneato-linearibus, margine nudis. Color roseo-cocci- 
neus (nee purpureus in vinosum aut lilacinum tendens). Substantia 
ita gelatinosa ut specimen semipedale chart:e arctissime adhzereat. 
. Rhodymenia erythrea Zanard. Plant. mar. Rubr. enum. (1858), 
p. 276, n. 107, Pieeone Algol. Eritrea (1884), p. 328, Rhodymenia 
palmata Mont. Pugill. Alg. yemens. p. 8 (excl. synon.), non alio- 
rum. — Fronde a stipite distincto cuneatim dilatata, palmatim di- 
visa et dichotoma, margine nuda, denticulata vel prolifera, seg- 
mentis apice ssepe multifidis; eystocarpiis hemisphzericis, minutis, 
in disco segmentorum singulis vel laxissime sparsis; tetrasporan- 
giis per totam superficiem densissime sparsis. 
Hab. in mari Rubro ad « Hodeida » (PonTIER) nee non ad oras 
Yemenses (MoNrAGNE). — Facies omnino Zhodymen?e palmate. 
Cellule interiores pauciores, oblongiores, parietibus firmioribus in- 
structz. Tetrasporangia per totam frondem densissime sparsa con- 
929 
930 
931 
