120 
PACIFIC SCIENCE, Vol. XI, January, 1957 
the peculiar exudation droplets from certain 
cortical cells seem to mark it clearly. 
Ceramium marshallense sp. nov. 
Fig. 21a, h 
Thalli creeping and entangled among other 
algae in low turfs, 1 cm. or less in extent, 
consisting of creeping lower parts fastened to 
surrounding materials by numerous rhizoids, 
and free branches 4-5 mm. long; branching 
primarily dichotomous, with occasional ir- 
regular secondary branches; sterile apices 
strongly forcipate and usually circinately in- 
rolled; main axes to 140-155 /x in diameter; 
cortication incomplete, consisting of nodal 
bands about 50-60 /x wide separating un- 
corticated internodal areas 40-70 /x wide; 
cortical bands consisting of a central ring of 
larger, isodiametrical cells about 22-30 /x in 
diameter and on either side, or somewhat 
overlapping, an irregular single to double 
ring of smaller angular cells 10-17 /x in great- 
est diameter; fertile, outer, erect parts of 
tetrasporangial plants somewhat catenately 
swollen, 160-185 /x in diameter; tetrasporangia 
mostly completely immersed beneath the 
tumid cortex, 35-40 /x in diameter, whorled 
after an initial tendency to be abaxial; sexual 
reproduction unknown. 
Thallis repentibus et implicatis ad 1 cm. 
longis a rhizoideis multis affixis, ramis solutis 
4-5 mm. longis, ramulis plerumque dicho- 
tomis, apicibus circinatis, axilibus principali- 
bus 140-155 /x diametro, cortice interrupta, 
vittis corticalibus noduloris ca. 50-60 /x latis 
Fig. 27. a, b, Ceramium mayshallense: a , Habit of a plant of the type collection, X 12; 3, detail of a node of the 
same, X 150. c, d, Ceramium sympodiale: c, Habit of a plant of the type collection, X 26; d, detail of a node of the 
same, X 150. e, Ceramium vagabunde: Habit of the upper part of a tetrasporangial plant of the type collection, X 34. 
