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5 N 
Neue japanische Florideen 
von K. Okamura, 
mitgetheilt von Fr. Schmitz. 
(Mit Tafel X.) 
I. Gelidium subcostatum Okamura mser. 
Frond compressed twoedged, distichously pinnate ; main-branches 
distinetly midribbed with acute axils. Tetraspores cruciate in cili- 
form simple or branched pinnae. Cystocarps oval, immersed below 
the apex of pinnae, bilocular. 
‚Root much branched. Frond compressed, 3-4 times distichously 
pinnate, 15—35 cm high, 2—5 mm broad, distinctly midribbed; the 
lower portion of the frond very thick in age. Branches elongated, 
2—3 times pinnate. All the larger branches midribbed; midrib gra- 
dually becoming fainter upwards, so that the upper branches beco- 
ming almost flat. All the axils acute. Ultimate ramuli subulate arising 
from somewhat triangular base. 
Frond consisting of 4 layers; the axial layer of elongated, 
hyaline fibres,; the next of a few layers of roundish angular cells; 
the subcortical again of elongated fibres, mixed with small colored 
cellules; the cortex of a layer of colored cellules. 
Tetraspores cruciate, immersed among the surface cellules forming 
a dense sorus in ciliform simple or branched pinnae. Cystocarps 
oval, immersed below the apex of pinnae, prominent on both sur- 
faces, bilocular; dissepiment longitudinal, connected with the walls 
of the cavity by slender filaments. Spores pearshaped on slender 
funiculi, attached to both surfaces ofthe median dissepiment. Color 
a purplish red, turning to greenish or yellowish. Substance cartilaginous 
and the frond does not adhere to paper in drying. 
Hab. Often cast up ashore, perhapes in deep tide, Sagami; Shima. 
The present species is nothing more than a species of Gelidium 
and is very interesting for the midribbed frond. Among Gelidiaceae 
a midribbed frond is only found in Suhria according to J. Agardh’s 
classification, but Suhria differs from Gelidium in the character of 
bearing fruit in proliferous ramuli. If my conclusion is not mistaken, 
