Polysiphonia of Tropical Pacific — Hollenberg 
207 
which are cut off as separate cells from the distal 
end of the pericentral cells and which may have 
multicellular tips; erect branches similar and 
slightly larger in diameter, arising endogenously 
or mostly cicatrigenously at intervals of 6-8 
segments, each erect branch mostly 2 segments 
and I/4 right-hand turn from another branch or 
a branch primordium, the latter usually com- 
posed of several cells; pericentral cells 8-(9?) 
ecorticate, composing segments mostly less than 
half as long as broad, with pericentral cells not 
in longitudinal rows but in offset position, re- 
sulting in a more or less hexagonal shape of the 
pericentral cells as seen in surface view; erect 
branches in turn bearing short, somewhat arcu- 
ate laterals and primordia; trichoblasts to 700p 
long, with about 5 dichotomies; arising at inter- 
vals of mostly 2-3 segments and ^ right-hand 
spiral, quickly deciduous, leaving scar-cells 
which quickly divide to form a cluster of small 
cells most of which remain as multicellular 
rudiments of potential branches; reproductive 
structures unknown. 
A single collection, D. 17242.1, growing 
with a member of the Gelidiaceae, was collected 
by Jessie Kajimara at Ili Bridge, Halona, Oahu, 
Hawaii, Nov. 14, 1956. 
This alga has very distinctive features, but 
the lack of reproductive structures makes its 
generic position uncertain. 
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