84 TUFTS COU.BGB STUDIES, VOL. IV, No. 7 



The hemispherical tuft appears to be a single individual, and 

 to be the normal form of the species. When growing in warm 

 high pools, a long floating tuft is sometimes developed, arising 

 from the otherwise unchanged normal frond. There is no 

 species of this region with which it is nearly allied ; the habit 

 somewhat suggests a worn frond of some small species of Spon- 

 gomorpha, but the resemblance is only in habit. 



61. C. PROFUNDA var. NORDSTEDTIANA Brand, 1902, p. 64. 

 Forming fine, loose, subradiate masses, branching erecto-patent, 

 often secund ; branches arising below the summit of a cell, the 

 first cross wall usually slightly above the origin of the branch : 

 main filaments 40-68 p. diain.. ramuli 23-35 /*; cells usually 

 8-30 diam. long, in lower part of frond occasionally only 4-8 

 diam. On limestone bottom of Lake Ontario, at 50 m. depth. 

 E. M. Kindle. 



The typical C. profnnda occurs in European lakes at a depth 

 of 10-15 m., and has filaments up to 85 \<- diam. ; the distance 

 from the point of origin of a branch to the summit of the cell 

 bearing it is about the same as to the first cross wall in the 

 branch, and the appearance is that of a forked cell, each fork 

 bearing another cell ; this appearance is less marked in var. 

 Nordstfdtiana . In the letter of Dr. Brand, identifying the 

 Ontario specimen submitted to him, he proposes to call it 

 "forma into, " but gives no characters. See Kindle, 1915, 

 P- 654. . 



62. C. moniliformis sp. nov. Fronde parce ramosa, inferne 

 dichotoma, ramis divergentibus, cellulis infimis ramorum vnl.u<> 

 adhaerentibus dimidio longitudinis, ramulis paucis, minorilms . 

 cellulis ramorum ^4-2 diam. longis/plerunujue diametrum paullo 

 superantibus, medio perinflatis, usque ad 145 /', dissepimento 

 solum 75-80 p. ; membrana manifeste striata, 20-25 /* crassa in 

 partibus adultioribus ; ramulis minus moniliforuiibus, nodis 

 autem semper manifeste constrictis, circa 60 /* diam. 



Frond little branched, dichotomous below, branches divergent, 

 lowest cells of the branches usually adherent for about half 

 their length; cells of the branches #-2 diam. long, usually a 

 little longer than wide, much inflated at the middle, up to 145 M, 

 at the ends only 75-80 /* ; wall manifestly striate, in the older 

 parts 20-25 M thick ; ramuli less moniliform, but always dis- 

 tinctly constricted at the nodes, about 60 M diam. Floating in 

 a pond at Los Angeles, California, Feb., 1915. N. L. Gardner, 

 No. 2570. Type in herb. F. S. Collins. 



