218 FRESH-WATER ALG^E OF THE UNITED STATES. 



Submerged grassy shores, Budd's Lake, New Jersey ; 

 brackish water, Egg Harbor City, N. J.; and shores of ponds, 

 Pennsylvania. 



Plate CXXXVII, figs. 5, 6, sterile and fruiting filaments, 

 Budd's Lake. 



Plate CXXXIX, figs. 1, 2, Pennsylvania specimen ; sterile 

 filament with root-like processes ; occurring frequently when 

 plants are only partially submerged. 



SPIROGYR.A ORTHOSPIRA, (Naeg.) Kg. 



Diameter of vegetative filaments, 58-65 ^ cells 2-3 times 

 longer than the diameter; spirals 3-4-5 (rarely 7), often 

 nearly straight or describing T to i turn in cell. Fructiferous 

 cells moderately swollen. Zygospores brown as they mature 5 

 lenticular, (orbicular flattened). Forms presented to the, 

 eye change as the position of the spore changes in the cell. 



Marsh pools, Pennsylvania. 

 Plate CXXXVI, figs. 10, 11, sterile and fruiting filaments. 



SPIROGYRA MAXIMA, (Hass. ) Wittr. 



Diameter of vegetative filaments, 118-125 /* ; cells a little 

 longer than broad ; chlorophyl bands, 6-7, margins finely 

 notched describing each i-l turn ; fructiferous cells not in- 

 flated ; zygospores lenticular, appearing according to posi- 

 tion in cell, spherical or elliptical ; diameter same as that of 

 filaments. 



Syn. Zygnema maximum, Hass.; Zygnema orMcularis, Hass.; 

 Spirogyra orbicularis, (Kg.) Petit. 



In large masses in streams, Bethlehem, Pa. Fruits very 

 abundantly latter part of Summer. 



Plate CXXXIX, figs. 3, 4, sterile, and fruiting filaments ; 

 figs. 5, 6, two spores germinating, from zygospores kept in 

 glass jars from September to the following January and 

 February. 



According to Petit this species often attains a diameter of 

 132-138 //. 



Var. IN^QTJALIS, Wolle. 



A singular variety of Spirogyra maxima; the one fila- 

 ment having a much larger diameter than the other con- 

 jugating with it. The larger measuring 125 //, the smaller 

 80 /^. The zygospore is most frequently in the smaller fila- 

 ment, and in consequence considerably smaller than the 

 zygospore of the typical form. The smaller filaments if seen 

 independent of the others would pass for 8. nitida, or 8. bellis. 



