342 Fresh-water Algw of Canada. 



Hab. — In the stream on the south side of St. Helen's Island, and 

 on the south-east side of Moffatt's Island, St. Lambert, Mon- 

 treal. 



This species is met with in slowly-running clear water, adher- 

 ing to rocks and stones, and is in good condition in summer and 

 autumn. It has to the eye the appearance of a green protruber- 

 ance, irregularly lobed at its extremities, and, in the more prolific 

 specimens, waving with the motion of the water. It seems to 

 grow in much greater luxuriance with us than it does in Europe. 

 Vaucher says of it that " it is but little more than a few lines in 

 length, and about half as broad." Our specimens are greatly 

 larger than this, and more prolific in their branches than any that 

 appear to have come under the notice of European botanists. One 

 which lies before us has a knotty stem as thick as a crow's quill, 

 and about an inch in length. From allsides of itbranches spring irrer 

 gularly, and are from an inch to an inch and a half in length, twice and 

 thrice compounded. The plant is of a bright-green color, which 

 it retains -when dried. It spreads over the paper in length four 

 and a quarter inches, and in breadth two and a half. Mr. Harvey, 

 in his description of this species, compares the mode of branching 

 of the frond to stags' horns, a comparison which conveys a very 

 good idea of the appearance of this beautiful object. 



The filaments contained in the matrix are fastigiate, articulate, 

 and closely packed in the gelatine. They throw out from their 

 sides dichotomously- branched ramuli, in a racemose manner, or 

 as one would arrange flowers in a bouquet. The whole surface 

 of the lobes or main branches has the appearanee of being cov- 

 ered with bristles, from the apices of which, and extending beyond 

 the mucous, there spring long gelatinous ciliaa. One marked 

 character of this species is that the bristles do not tuft or form 

 protruberances ; but are equally distributed over the lobes, a good 

 illustration of which is given in Vaucher's fig., Plate XIII. 



II. Ch. mammosa % 



Char. — Mucous matrix somewhat compressed, suhdichotomouslg 

 branched. Primary hranches frequently parallel, containing 

 numerous irregular protuberances. Ultimate ramuli of the 

 filaments tufted, fasciculate. 

 Hah. — Same as the preceecling. 



This species differs evidently from any that are figured or de- 

 scribed by either Vaucher or Hassall. The mucous is much firmer 



