Fresh-Water Algce of Canada. 451 



A further comparison with specimens from the collection of 

 the late Dr. Landsborough convinces us that this Batrachosperm 

 is none other than B. moniliforme. The species is very rare in 

 Scotland, and was found by Dr. Landsborough only in one or 

 two localities favorable for the warmth of their temperature, — in 

 one instance in a stream in which the water from a condensing 

 steam-engine flowed. As compared with ours, Dr. L.'s plants 

 have a very poor and sickly appearance, and the figure given by 

 Vaucher (natural size) is quite diminutive. It would thus appear 

 that although we have not obtained a new species, we have yet 

 to say that our plant is greatly more prolific and more distinct in 

 its characters than any of the described European species. We 

 deem it of sufficient importance and beauty to present to our 

 botanical readers three illustrated figures of its principal parts, 

 together with a full description of its characteristic features. 



Batrachospermum moniliforme. Vauch. Figs. 1-3. 



Char. — Frond dark green, very mucous, large. Main branches 

 dichotomous ; secondary branches irregular, partially secund, 

 divaricate, beset with short ramuli, irregularly pinnate, occasion- 

 ally compound. Whorls of the stems spherical, distinct, distant, 

 large, those of the branches sub-distant, and those of the ra- 

 muli approximate, The inter nodes of the main stems and 

 the base of the larger branches beset with short, minute, 

 branched, articulate fibrillce. 



Hub. — On stones, in a clear, rapid stream. Paris, Canada 

 West. 



This is really a most beautiful plant. A frond now before us 

 covers, in its dried state, a space of six inches by five, and is very 

 prolific-ally branched. Fig. 1 (p. 452) is a representation of one of the 

 main stems. The extremities of the branches are rather more 

 delicate than in the original, but otherwise it is an accurate 

 likeness of the object. The whorls are as distinctly marked in 

 the original as they are in this figure. 



The second illustration (p. 453) represents the appearance of the 

 whorls with the fibrillce between the articulations, and a branchlet, 

 as seen under a half-inch object glass. In the original the whorls 

 are rather more distinct, and their filaments more crowded than 

 they appear here to be represented ; but, upon the whole, the 

 wood-cut comes very near the appearance of the object itself. 



