20 
SIPHONACEiE. 
ing hairs ; fronds erect, stipitate, scattered, simple or slightly branched, densely set on 
all sides with imbricated, erect, setaceous, acute, or mucronulate ramenta. (Tab. 
XXXVII. B.) 
Hah. On sand-covered rocks at Key West, abundant, W.H.H . (v.v.) 
Surculi prostrate, widely creeping and rooting from the lower side, everywhere densely 
clothed with woolly, branching hairs, which are slightly viscid and collect par - 
tides of sand ; the whole mass of surculi forming a dense mat. Fronds rather distantly 
scattered, erect, stipitate. Stipes 1-2 inches long, filiform, tomentose, the hairs branching. 
Frond simple, or rarely once-forked, two to four or six inches long, very densely beset 
on all sides with slender, setaceous, erect, incurved, imbricated, acute, or mucronulate 
simple ramenta, which are two or three lines long, and nearly of capillary diameter. 
Substance somewhat horny when dry. Colour , a deep and rather a dull green, paler 
in the surculi and stipites. 
I had at first taken this plant for Caulerpa Selago, but Turner expressly says of that 
species that the creeping stems or surculi are “ smooth, shrinking, and wrinkled when 
dry whereas in our Key West plant they are everywhere densely clothed with 
branching, woolly hairs. His figure (Hist. Fuc. t. 55) also represents the fronds as 
sessile, or ramuliferous to the very base. With no other species can the present be 
confounded. C. Selago is a native of the Red Sea. Two Australian species, C. Brownii 
and C. furoifolia , have been sometimes confounded with it, but in both of these the 
surculi are clothed with ramuli resembling those of the erect branches. 
Plate XXXVII. B. Fig 1. Caulerpa Lycopodium, the natural size. Fig. 2, whorled 
ramenta in situ. Fig. 3, a ramentum, detached. Fig. 4, portion of the woolly 
stipes. Fig. 5, branching hairs from the same. The latter figures more or less magnified. 
7- Caulerpa ericifolia , Ag. ; surculi robust, naked and glabrous ; frond shortly 
stipitate, irregularly much branched ; branches scattered, repeatedly divided, clothed 
on all sides with short, ellipsoidal, succulent, mucronulate, erecto-patent ramenta, set in 
3, 4, or 5 ranks. Ag. Sp. Alg. 1, p. 442. Chauvinia ericifolia , Kutz. Sp. Alg. p. 497. 
Trevis. 1. c.p. 137. Fucus ericifolius , Turn. Hist. t. 56. (Tab. XXXIX. A). 
Hab. Key West, W. H. H. Conch Key, Prof. Tuomey. (v. v.) 
Surculi prostrate, robust, as thick as crow quill or thicker, branched, extensively 
creeping, glabrous, glossy, shrinking and deeply channelled longitudinally when dry, 
rooting from the under surface ; the roots distant and very long, branched and fibril- 
liferous. Fronds erect, scattered, with short, simple or forked stipites, much and 
irregularly branched ; branches scattered, once, twice, or thrice compounded, very erect, 
as are also all their lesser divisions, all the angles being close and acute ; ramenta 
densely set, tri-, quadri-, or quinquefarious, short, somewhat intricated, the lowermost 
