DESMIDIE^E. 



APPENDIX TO DESMIDS OF THE UNITED STATES. 



Genus, GONATOZYGON. V. Des. U. S. p. 22. 



G. SEX-SPINIFERUM, Turner. 



Joints variable in length, ten to thirty times the breadth ; 

 base swollen, apex either rotmido- truncate or quite rounded ; 

 spines, or rather setae, very short and arranged longitudi- 

 nally in six linear series. Forming long filaments. Min- 

 nesota. 



Length of joints 88-191 ^ ; diameter 6-8 /*. 



Genus, HYALOTHECA. V. Des. U. S. p. 22. 



H. DISSILIENS, Yar. HIANS, n. var. Plate LIY, figs. 14-16. 



Differs from the typical form in having the lateral margins 

 of the cells arched with an acute notch in the middle. 



Diameter 25-50 /*. 



The larger form from Budd's Lake, New Jersey; the 

 smaller from ponds near Maitland, Kissimme and other 

 localities, Florida, sometimes occurring in large masses. It 

 is nearly allied to a New Zealand species described by Nord- 

 stedt as If. hians. Often difficult to distinguish from par- 

 tially developed forms of Desmidium quadratum. End view 

 is circular ; has no evidence of a thickened border or a twist. 



Genus, BAMBUSINA. Y. Des. U. S. p. 24. 



B. GKACILESCENS, Nord. Plate LIX, figs. 13, 14. 



This form is described as a variety of B. Brebissonii. 

 Whether viewed as such or as a distinct species, it was an 

 interesting discovery to find it fruiting freely in a pond near 

 Winter Park, Florida. 



Diameter of cells 14 // length 23 ^ ; zygospores 15 ^ 



