WISCONSIN PET TOPLAN ETON 143 



var. APERTA (Telling) Brunnthaler. PI. 35, Figs. 5-6. 



in Pascher, Siisswasserfl. Deutschl. b'sterr. u. d. Schw. 5 2 : 182, fig. 268. 1915. 

 Kirchneriella aperta Telling, Sv. Bot. Tlds. 6: 276, fig. 9. 1912. 



Cells with blunt, rounded apices, concave side between apices broadly 

 V-shaped. (Facultative Planktont). 

 Diam. cells 6-12 /x. 

 Diamond (rr), Palmer (SB). 



KIRCHNERIELLA CONTORTA (Schmidle) Bohlin. PI. 35, Fig. 7. 



Bin. Kgl. Sv. Vet.-Ak. Handl. 23, Afd. 3, No. 7: 20. 1897. 



Kirchneriella obesa, var. contorta Schmidle, Flora 78: 44, pi. 1, fig. 2. 1894. 



Cells cylindrical, arcuate or in spirals that never make more than 

 iy 2 turns; ends rounded, not tapering. Cells generally lying some 

 distance from one another within the homogeneous colonial envelope. 

 Chloroplast single, filling the entire cell, without a pyrenoid. Cells 

 sometimes spirally arranged in the colony; rarely more than sixteen 

 cells in a colony. (Facultative Planktont). 



Cells 0.7-2.0 fi broad, 8-14 /x long ; colonies up to 60 p. in diam. 



Chain (rrr), Clear (rr), Cochrane (rr), Fowler (rrr), Mendota (rrr), Par- 

 dee (rr), Pine Tree (rrr), Poor Farm (rrr). 



A species which at first glance does not appear related to K. lunaris 

 and K. obesa, but which at times shows a certain resemblance to 

 K. obesa var. major. It and the following species are rare algae in 

 Wisconsin. They are closely related, the chief difference being the 

 smaller size and fewer number of cells in the colony of K. contorta. 



KIRCHNERIELLA ELONGATA G. M. Smith. PI. 36, Figs. 1-2. 

 Bull. Torr. Bot. Cl. 43: 473, pi. 24, fig. 1. 1916. 



Cells elongate-cylindrical with rounded ends ; spirally or irregularly 

 twisted. Colonies of 4-8-16 or more cells arranged in a snarl at the 

 center of a copious homogeneous gelatinous sheath. Chloroplast single, 

 parietal; without a pyrenoid. (Facultative Planktont). 



Cells 2-3 fi broad, 15-25 /* long ; colonies up to 100 p. in diam. 



Devils (2) (rrr), Horse (rrr), Lac Court Oreilles (rr), No Mans (rr), 

 Palmer (rr), White Ash (sss). 



Sub-family CRUCIGENIEAE. 



Cells acicular, fusiform, ovoid, triangular, or trapezoidal; in flat 

 coenobia with the number of cells always a multiple of two. Cells 

 quadrately arranged in coenobe or in a linear series. Coenobe gener- 

 ally without a gelatinous envelope. Chloroplasts 1-4, parietal, disci- 

 form or laminate ; generally with one pyrenoid. 



