1902] Collins, — An Algologist's Vacation in Maine 175 



of species represented is relatively large. Specially noticeable here 

 was the Laminaria formation, near and below low water mark. 

 Laminaria stcnophylla occurred here in a considerable colony just 

 at low water mark, on a smooth, steeply sloping rock, exposed to 

 the full force of the waves. At the time I discovered this colony 

 the sea was exceptionally quiet, and I secured as much as 1 could 

 take away in my bag. When I returned for more, the next day at 

 low tide, the waves were washing up on the place where I must 

 stand. Any good botanist would cheerfully take a drenching for 

 the sake of a good specimen, but in this case not merely a drenching 

 but a carrying out to sea was fairly likely, and the needed specimens 

 had to be given up. 



Chorda tomentosa was abundant in the harbor, growing in pretty 

 deep water, and stretching along the surface at low tide, as C. Filum 

 does in most places. The plant is not uncommon all along the New 

 England coast, but a plant two feet long is a large specimen, 

 usually; the original description by Areschoug says "Planta usque 

 metrum longa"; but here, growing in dense tufts, the plants often 

 become 15 feet long, and with dense hairs standing out appear as 

 stout as one's finger. 



Another plant occurring here in individuals of unusual size was 

 IleafuIvesceJis. It is a common species in its special habitat, but 

 usually in fronds so small as to be noticeable only in the mass. 

 Here it had the habit of Enteromorpha intcsthialis, and fronds over 

 a vard long and half an inch in diameter were found. It seems to 

 occur only where it can have alternately fresh and salt water ; the 

 Cutler locality is exceptionally favorable, at the mouth of a consider- 

 able brook. At low tide the stream runs briskly over the stones on 

 which it grows ; at high tide they are under several feet of salt water. 

 Ilea firfvesccns is nearly related to Enteromorpha, in which it has 

 sometimes been included ; it is chiefly distinguished by the very 

 gelatinous cell wall, the cells arranged in distinct groups of fours. 

 These characters seem to be connected with its peculiar habitat, 

 and occur in other plants exposed to fresh water, Monostroma 

 quaternarium, for instance, otherwise hardly distinguishable from the 

 marine M. latissimum. These characters of gelatinous membrane 

 and cells in groups of fours appear in a still greater degree in the 

 genus Tctraspora, common in fresh water everywhere, but not found 

 in the sea. 



