STAURASTKUM. 145 



ST. FRANCONIUM, Eeinsch. (St. divaricatum, Wolle.) Plate 



LVII, fig. 22. 



This species is separated from the preceding (St. pusillum) 

 by its somewhat larger size and by having in end view, five 

 processes with bifid apices, not obtuse. The typical plant 

 is described by the author, "membrana glabra, (aut cornua 

 verruculosa)." Our forms are always granular. 

 Diameter about 30 yu. with processes. 



This, and the preceding, not common, but they appear in 

 many widely separated localities in New Jersey and Penn- 

 sylvania. 



ST. HAABOELIENSE, Wille. Plate LIII, figs. 51-53. 



Small, about one-third more in breadth than length ; con- 

 striction in the middle forms a wide sinus; semi-cells in 

 front view subelliptic, ends bicuspidate, margins dentate; 

 in vertical view triangular or rarely quadrangular, sides 

 sinuate. Membrane granulate. 

 Diameter 24 /u. ; length 18 u. 



Found this form several times in ponds, New Jersey ; it 

 differs slightly from St. tricorne except in the apices, which 

 are not obtuse but bicuspidate. 



ST. BOTROPHILUM, Wolle. Plate LIII, figs. 11-13. 



Somewhat longer than broad, distinctly granular; granules 

 arranged in concentric series; semi -cells, front view, sub- 

 triangular, with ends broadly truncate, sides moderately 

 convex or nearly straight, converging, basal angles rounded ; 

 end view triangular, angles rounded, sides slightly convex 

 or straight ; lateral view, subelliptic. 

 Diameter 36-38 p. 



Collected in marsh ditches near Bethlehem, Pa. In front 

 view it has the appearance of a Cosmarinm, like some form of 

 notrytia, but in side and end views it is a Staurattfruni. 



ST. PRINGLEI, Wolle. Plate LXI, figs. 25. 



Cy tioderm granular ; of equal length and breadth ; con- 

 striction not deep, sinus wide; semi cells subtriangular, 

 sides rounded, end concave with a central inflation, angles 

 acute. End view triangular, sides concave, angles acute. 

 Membrane rough with fine granules. Surrounded by a thick 

 gelatinous sheath. 



Diameter 28-33 p. 



Found by C. G. Pringle, Nebraska Notch, Vt. 

 10 



