Lake Maxinkuckee, Physical and Biological Survey 181 



With the low power of the microscope the rhizoids are long 

 hyaline unicellular hairs. Clear rootstock-like object with large ir- 

 regular tubercle-like lumps ; perhaps from these lumps the branches 

 have been accidently removed. Connected with these and without 

 any intervening septae is a long tubular uncorticated cell, hyaline 

 below where there is no coating of material. In this cell very active 

 protoplasmic streaming may be noted, downward on one side and 

 upward on the other, each side of a narrow oblique line of rest. A 

 considerable number of large clear globular bodies like oil-drops, 

 and innumerable minute granules make up the rapid streaming 

 mass. Above this cell is encrusted, and movements cannot be ob- 

 served. At the upper end of this cell is a node where there is a 

 large number of turgid approximately equiaxial nodal cells. There 

 was no cortex on the second internode. The third and all following 

 internodes are corticated in the manner described below. 



The cortex extends parallel with the long axis of the internode, 

 or nearly so, exhibiting very little torsion. The cortical cells are 

 turgid, cylindrical, about 3 times as long as broad, and there are as 

 many as 10 or more placed end to end in one internode. In every 

 third row of cortical cells there is between the ends of any two suc- 

 ceeding cells, a short rectangular cell of a rich dark-green color. 

 These cells are at about the same height on the internode, so each 

 series makes a circle of studs around the central cell. The cortical 

 cells each side of those furnished with the rectangular stud-cells 

 are not thus furnished but have their ends in contact at about the 

 middle point of the stud-cells, so that the series of cortical cells with 

 the stud-cells breaks ranks with the next pair of series of each side 

 where there are no intercalations. These intercalated cells prove 

 on further examination to be optical sections of the base of 

 trichomes or "stipules" which project from the internode. These 

 stipules are elongate conical cells, somewhat acute at the apex, and 

 the fact that they are viewed end on, showing greater depth, makes 

 them appear much greener than the other cells. 



The stipules situated at the base of the internode appear in 

 general to point upward, those in the upper part downward. Just 

 below each node these form a long thick fringe which hangs down- 

 ward. 



Antheridia, brick-red globes with shield cells finely displayed 

 surrounded by a peripheral layer of light clear green cells, are 

 situated below the oogonium and its subtending leaves. 



Oogonium lighter orange-red, barrel-shaped, its investing cells 

 twisted very strongly. Coronal cells 5, the apex being blunt. 

 Stems or branches corticated to near the end with a series of 



