86 CONFERVACE^. 



3 Chjetomorpha cerea, Dillw. ; root scutate ; filaments setaceous, tufted, straight, 

 (sometimes twisted in age) harsh and brittle, yellow-green ; articulations about as long 

 as broad. Dillw. Conf. t. 80. E. Bot. t. 1929. Lynb. Hyd. Dan. t. 51. J//. Syst. 

 p. 100. Wyatt, Alg. Danm. No. 191. Harv. Phyc. Brit. t. 99. B. Kiitz. Sp. Alg. 

 p. 379. 



Hab. In rock pools, between tide marks, &c. Newport, Professor Bailey. New 

 York Bay, Messrs. Hooper, Walters, 6fc. (v. v.) 



Filaments generally in dense tufts, 3-12 inches in length, and as thick as hog's 

 liristle, rather harsh to the touch when fresh, but much less rigid than C. melagoniurn, 

 and collapsing on being removed from the water, usually straight, but old specimens are 

 sometimes crisped and contorted. The colour when growing is a beautiful yellowish 

 green, but dried specimens are usually much faded, and dull-greenish white after long 

 keeping in the Herbarium. The endochrome fills the cell and is of a watery consistence, 

 and dispersed in drying. The articulations are pretty uniformly as long as broad, witli 

 contracted dissepiments. 



4. Cn^TOMORPHA Olneyi, Harv. ; filaments tufted, setaceous, straight or curved, soft, 

 pale-green ; articulations once and half as long as broad. (Tab. XLVI. D.) 



PIab. Rhode Island, Mr. Olney. (v. s. in Herb. T.C.D.) 



This has the habit of C. cerea, but is of a soft and flaccid substance, adhering closely 

 to paper in drying. When dry it is very pale, greenish white, and without gloss. 

 The filaments are about the same diameter as those of C (area ; the articulations are 

 longer, and the cell-wall thicker. 



Plate XLVI. D. Fig. 1. Cii.etomorpiia Olneyi, the natural size. Fig. 2. a portion 



magyiified. 



.5. Cii^TOMORPiiA longiarticulata, Harv. ; filaments capillary, curved, loosely bundled 

 together, flaccid, soft, pale green ; articulations 4-6 times as long as broad, swollen at 

 tlie nodes. (Tab. XLVI. E.) Var. ^. crassior ; filaments more robust. 



Hab. In rock pools, between tide marks. Ship Anne Point, Mr. Hooper. Boston 

 Bay, Mrs. Asa Gray. Little Compton, Mr. Olney. Var. /3, in brackish ditches at 

 Little Compton, Mr. Olney. 



Filaments rather more slender than human hair, 3-4 inches long, loosely bundled 

 together, and somewhat stratified. Articidations filled with very pale endochrome, 

 almost hyaline when dry, several times longer than their diameter, nodoso-incrassate at 

 one or both ends, witli contracted dissepiments. The cell-wall is very thin and mem- 

 branous. 



