Derbesia fastigiata W.R.Taylor

Taylor n. sp. Carnegie Inst. Wash.
279; 94.	f. 18. 19 28.
Derbesia ? fastigiata'
( Plate 11, figs. 1 to 3;
Plant filamentous, lubricous, 0.5 to 2.0 cm.
high, coenocytic,dichotomously branched, densely
interwoven below,the upper filaments erect; lower
portion of filaments distantly branched, straight
to flexuous, occasionally spirally twisted, not
constricted above the forks,50 to 75u in diameter;
erect filaments ending in a series ot closely
placed, fasciculate dichotomies of 4 to 7 successive
divisions frequently slightly thickened at right
angles to the fork just below each division, giving
a tuft 850 to 1,010u in length; diameter of’the
filaments just below the tuft 25 to 42w,the ultimate
divisions 7.5 to ll^i in diameter; the'ultimate segments
tapering toward the apices, which are rounded; sterile.
Eere newly described from Florida.
On the laboratory wharf, loggerhead Key, and on
Sodium, Garden Eey.Dry Tortugas, Florida.
lacking fertile material a definite generic assign-
ment of this plant is not possible.
02131514