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PACIFIC SCIENCE, Vol. VIII, October, 1954 
Fig. 52. Gymnogongrus japonicus: Habit of part of a young cystocarpic plant, X 2.5. h, Gigartina intermedia: 
Habit of a young plant showing formation of accessory attachment discs from tips of arching branches, X 5. 
c, Champia parvula: A small upper part of a plant, X 10. d, Gymnogongrus serenei: Habit of an antheridial plant of 
the type collection, X 1.5. e, Champia vieillardii: Habit, X 3. /, Catenella nipae: A portion of a plant dissected 
away from the mangrove root and seen from the upper surface, X 3. 
erect, semi-rigid, flat, subsimple to dichotom- 
ously branched, ligulate, non-stipitate blades 
from a small, discoid attachment; blades 1.0- 
2.5 mm. broad, 300-400 n thick, infrequently 
branched, mostly at intervals of 1 cm. or more 
and with narrow angles; margins entire; tips 
blunt; structure consisting of a medulla of 
rotund, thick-walled cells 30-50 yu in diameter, 
elliptical in longisection and with many inter- 
cellular connections, abruptly grading into a 
cortex of anticlinal rows of three or more 
small, elliptical cells about 4.5 ijl in diameter; 
antheridia borne superficially in elongate sori 
on the surface of the blades; cystocarps borne 
on the surface of the blades, 800 yu in diameter 
or more, very prominent, hemispherical, some- 
times causing a bulge on the opposite side 
of the blade; tetrasporangia not seen. 
type: Holotype is Dawson 11268, Feb. 6, 
1953, in the U. S, National Herbarium. 
Type Locality: Occasional at middle levels, 
Sta. 8. 
