Lake Maxinkuckee, Physical and Biological Survey 183 



former had received from his correspondent material from North 

 America of what he beheved was N. monodactyla. This might 

 well refer to early collections of the present species, but too many 

 of the present deductions are conjectural to admit of anything- ap- 

 proaching certainty. If this species should turn up in fruit, its 

 study may be of great interest." 



34. NITELLA TENUISSIMA Kuetzing 



A Nitella growing in rather shallow water, 1-3 feet, in positions 

 similar to "sp. No. 4 Chara". The specimens were preserved in 

 alcohol labelled "Sp. No. 5 Nitella". 



The whole plant grows in rather dense tufts, about 1 inch in 

 diameter. Color dark green. Rhizoids not conspicuous. Main 

 stems many, exceedingly slender, the internodes hardly more 

 than 1,^12 in. long. The branches arise in whorls making a dense 

 globular mass at each node, so that the plant looks a good deal like 

 Rivularia spheres attached to a slender stalk. These spheroids of 

 branches are larger and closer together toward the apex of the 

 plant. 



With low power of the microscope : Rhizoids long, hyaline, 

 cylindrical tubes with occasional peculiar thickenings. The inter- 

 node below the whorl is clear, and in it active movements of the pro- 

 toplasm may be seen. Higher internodes light green. The inter- 

 nodal cell is expanded like the ball of a ball and socket joint at the 

 node. 



The masses formed by the nodes were quite firm, and had to be 

 flattened out by compression, before study. A node flattened out 

 presented the following appearance : From the node on the central 

 axis radiate several rather stout cells, the basal cells of branches 

 which branch repeatedly in the manner described above. About 

 the axis of the tertiary branches are formed the reproductive 

 organs. Antheridia globular, brick-red, the brick-red portion sur- 

 rounding clear cells. The shield-cells show up fairly well, but are 

 not so large as in the Chara just described (foUolosa) . All the 

 internodal cells of whatever order are tolerably short. The final 

 members of the series or leaves are long slender cylindrical cells 

 composed of one long slender cell of uniform diameter and a sharp 

 attenuated conical cell at the apex. 



Oogonia from nearby globular to short ovoid, on the same node 

 as the antheridium and on a level with it. Contents dark in color, 

 the cells of its investing integument in a close spiral. Crown 2- 

 celled. In the autumn of 1900 a great deal of this Nitella was 



