186 CRYPTONEMIACEiE. 



Hab. Dredo-ed in four or five fathom water. Vars. a and/3, Peconic Bay, abund- 

 antly, Prof. Bailey and W. H. H. Narragansett Pier, Mr. Olney. Providence, Prof. 

 Bailey. Weymouth Pier, Quincey, JIassachusetts, Dr. Durkee. y, abundant in 

 Charleston Harbour, S. Carolina, Prof. Gihbes and W. H. H. (v. v.) 



Tufts globose, two to three inches in diameter, dense and often intricate, sub-fas- 

 tigiate. Fronds in vars. a and /3 as thick as hog's bristle, branched from the base 

 in a very irregular manner, all the divisions standing at considerable angles and 

 much divaricated. In var. a all the branches are strongly arched back, or revo- 

 lute, destitute of branchlets on the concave side, and this ramification is repeated 

 several times. In /3 the tendency to secund ramification is nearly as great as in a, 

 but the branches are straighter and more attenuate. In 7, which may possibly be 

 a different species, the frond is as thick as sparrow's quill, of firmer substance, and 

 the ramification partakes sometimes of the character of a, sometimes of /3. Concep- 

 ceptacles unknown to me. Tetraspores immersed in the smaller ramuli. Colour a 

 pinky red, becoming darker and somewhat brownish when dried. In drying, it 

 adheres closely to paper. 



I formerly distributed this plant under the MS. name C. divaricata, a name which 

 must be laid aside if the Fucus divaricatus, R. Br. be correctly referred by Prof. 

 Agardh to this genus. Nor am I certain whether the specific name now imposed 

 be more than provisional, as future observation may show our plant to be identical 

 with the Ch. uncinata of the Mediterranean, a point which I have not at present the 

 means of determining satisfactorily. 



However this may be, our vars. a. and /3 appear to form a well marked species. 

 Perhaps var. 7 should be separated ; being much more robust, more readily re- 

 covering its form after having been dried, and when pinnulated, not unlike some 

 states of Ch. clavellosa. 



Tab. XX. C. Fig. 1. Chtlocladia Baileyana, var. a ; fig. 2, var. /3 ; both of the 

 natural size. Fig. 3, part of a branch of var. 7, with ramuli, containing tetra- 

 spores ; mafjnified. Fig. 4, cross section of a branch of var. 7 ; and fig. 5, portion 

 of the same, variously magnified. 



2. Chtlocladia rosea, Harv. ; fronds sub-stipitate, distichously-pinnate or bi-pin- 

 nate ; pinnte and pinnules elliptic oblong, obtuse or sub-acute, much constricted 

 at the base, compressed, opposite. Harv. in Phyc. Brit. t. 301 and t. 358 A. 



Hab. On small Algte in tide-pools, rare. Newport, Rhode Island, 3Ir. George 

 Hunt and Mr. S. T. Ulney. /3. Portsmouth, New Hampshire, Dr. Durkee. (v. s. in 

 Herb. T. CD.) 



Fronds densely tufted, one or two inches high, one to two lines broad, compressed, 

 twice or thrice pinnate ; the pinna; distichous, opposite or rarely alternate, or by 

 suppression unilateral, oblong-linear, much constricted at the base, obtuse, the 

 lowest longest, the rest gradually smaller ; pinnules elliptical, very obtuse. Colour, 



