101 



DESCRirTION OF THE TLATE. 



Fig. J.— Two plants, ij nat. size. 

 2. — A plant, magnified. 

 3. — A stem leaf. 

 4. — Tip of stem leaf. 

 5.— Perichxtial leaf. 

 6. — Perigonial leaf. 



7. — Stomata of collum. 

 S. — Calyptra. 



D. C, Eaton 



New Haven, February, iStjo. 



Notes on Some of the Plants Found in Muskoka Lake, 



Sept. 1st, 1889. 



The Range of Sitbularia aquatica. In regard to the range 

 oi Siibularia aqitatiea, whose North American stations formed 

 so interesting a communication in tlie November BULLETIN, 

 Bentham in his ** Handbook of the British Flora," gives: — 



** The shallow edges of alpine ponds and lakes, in northern 

 Europe, Asia, and America, and more rarely In central Europe. 

 Scarce in Britain, in the mountains of Scotland, northwestern 

 England, and north Wales." In the second edition of VVither- 

 ing*s Botany, 1787, it is said that tlie Suhiilaria aquatica grows 

 under water on a gravelly bottom in Lough Neagh, Ireland, on 

 the side next Kilmorc, Ray; Loch Tay and Loch Carran, Scot- 

 land. Mr. Stuart; in lakes on the mountains near Llanberrys. 



Hudson; and Llyn-y-Cwn, near Snowdon, Pennant." 



Lobelia Dortinanna is found abundantly in the shallow parts 

 of the lakes in the north and northwest of Great Britain, especi- 

 ally in the mountain regions ; often, according to Hooker and 



Arnott, forming a carpet at the bottom of the water with its 

 densely matted foliage. 



In the southeast corner of Dcrwentwater, at intervals ranginj^ 



from a few weeks to ten years, a blistcr-likc upheaval of the peat 

 occurs, bringing the bottom of the lake up from six feet beneatli 

 to a few inches above the surface of the water. A careful ex- 

 amination of this popularly called floating island, reported in a 

 recent history of it by Mr. G. J. Symons, shows its surface to be 

 covered with living specimens ot Lobelia Dortinanna, L., Isoetes 

 lacnstris, L. and other water plants that abound in the lake. 



