26i BOTANICAL GAZETTE. 



Mr. C. F. Wheeler, of Hubbardston, Mich., sends it from his vicinity. 

 Its fruiting season is long. It was gathered with well formed 

 fruit May 28, and found fresh and in fruit as late as September 6. 



Potamogdon pauciflorus,VviX%\\. Typical forms are found at Man- 

 istee and Frankfort. These have fine, almost hair-like leaves. I 

 have not yet met with these here, as all the plants seem to have the 

 type of fruit of P. Niagarensis, and the leaves broader, with a larger 

 and coarser growth of stem. Both forms usually grow in dense masses, 

 often completely covering or even filling the water if very shallow, the 

 stems being so entangled as to be separated with difficulty. I io'und 

 none of the form of P. Mairarensis, last summer, on, the eastern shore 

 of Lake Michigan, between Frankfort and Ludington, unless some 

 broader leaved specimens, growing with P. pauciflorus, but without 

 fruit, be of this kind. Those seen this summer at Sault Ste. Marie, 

 and on the east side of St. Mary's River, in Ontario, and at Mackinac 

 have the fine leaf. 



Pofamogeton pusilliis, L., var. j/iajor, Fries. This plant, hith- 

 erto considered very rare and hard to get, grows in great abundance 

 at Manistee, in the lake and river of that name, and in the Aux Bees 

 Scies, at Frankfort. In both these places it was the prevailing form 

 so far as observed. In 1878, while making the "inland passage" 

 between Cheboygan and Petoskey, Mich:, a few plants were picked 

 out of Crooked River, but under conditions that did not allow of a 

 determination of its abundance. The evidence is in favor of its be- 

 ing common in the northern part of the southern peninsula of Michi- 

 gan. This conjecture, made on the evidence of last year's examina- 

 tion of localities in Michigan, has been strengthened by the experience 

 of this summer. All plants of P. pusillus seen in the St. Mary's 

 River, at Sault Ste. Marie, were of the var. major. Perhaps it is es- 

 sentially a northern form. It may be looked for in other places east 

 of Lake Michigan, within the Umits of that State, and in Wisconsin 

 and northward. Until the present season I had marked it as "rare at 

 South Chicago," having found a few specimens. This season I have 

 found it in fair quantity at this place, thus, in all probability, indicat- 

 ing the range of the plant as co-extensive with Lake Michigan. Near 

 Chicago the forms of P. pusillus incline to the var. tenuissimus, Mer- 

 tens & Koch, typical specimens of the plants being hard to find. 



Pofamogeton marinus,!^. This was gathered in Crystal Lake, east of 

 Frankfort. It grows in sand in the shaflow water by the margin' oV the 

 lake. The stems rise from running rootstocUs to the height of two to 

 six inches. The stigma is not sessile, but with a short style, diff'ering 

 in this from the type species. Mr. Wheeler sent the same plant for 

 identification, the habitat of which was unfortunately lost To make 

 the determination of the Crystal Lake specimens certain they were 

 sent to Mr. Morong, of Ashland, Mass., and the only -difference no- 

 ticed is the presence of the short style. In the specimens sent by 

 Mr. Wheeler the stigma is more nearly sessile. Since writin^r the 



