20 SIPHONACE^. 



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, al)undant, W.H.H. (v. v.) 



SurcuU prostrate, widely creeping and rooting from the lower side, everywhere densely 

 clothed with woolly, branching hairs, which are slightly viscid and collect par- 

 ticles 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. Fm. t. 55) also represents the fronds as 

 sessile, or raniuliferous 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. furcifoUa, 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. Figl. CavleVxFA Lycopodlum, the natural size. i^;7/. 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, ;;. 442. Chauvinia ericifolia, Kiitz. Sj). Alg. p. 497. 

 Trevis. I. c. p. 137. Fucus erici/olius, Turn. Hist. t. 56. (Tab. XXXIX. A). 



11 AB. Key West, W. H. H. Conch Key, Prof. Tuoniey. (v. v.) 



Surmli prostrate, robust, a« thick as crow quill or thicker, branched, extensively 

 creeping, glabrous, glossy, shrinking and deeply channelled longitudinally Avhen dry, 

 rooting from the under surface ; the roots distant and very long, branched and fibril- 

 liferous. Fronds erect, scattered, with sliort, 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 quinquefirious, short, somewhat intricated, the lowermost 



