This species differs in having a stipe which is much stouter and 

 less tapering than in the other described forms. It should be com- 

 pared with S. capense, which has a very similarly shaped lorica but 

 a very slender, tapering stipe, as well as with Derepyxis amphora, 

 which it superficially resembles. D. amphora has a cross partition 

 through the basal region of the lorica, and the protoplast is attached 

 by fine threads to the sides of the envelope. The gross appearance 

 of S. crassistipatus suggests relationship with Derepyxis, and subse- 

 quent study of living specimens may result in its transference to 

 that genus. 



On filamentous algae in acid bogs and soft water lakes. Wis. 



Stipitococcus urceolatus West & West 1898, Jour. Bot., 36, p. 336 



PI. 93, Figs. 20-22 



Lorica pitcher-shaped, ovoid, with a flaring 2-lipped apex, attached 



by a fine, thread-like stipe without a basal disc; chromatophores 1-2 



parietal plates; lorica 3-4/i, in diameter, 6-11/i, long; stipe 4r-6[x long. 



Attached to filamentous algae in Sphagnum bogs and acid swamps. 



Mich.,Wis. 



Stipitococcus vasiformis Tiffany 1934a, p. 32 

 PI. 95, Figs. 32, 33 

 Lorica broadly ellipsoid or subglobose, on a short, slender stipe, 

 abruptly narrowed anteriorly into a relatively long neck with 

 parallel or subparallel margins, the apical opening not enlarged; 

 protoplast with 1 faintly pigmented, plate-like chromatophore; cells 

 4.5-7/u, in diameter, 8-13/u, long. 

 In acid and soft water bogs. Mich. 



ORDER HETEROCAPSALES 



In this order the plants are simple colonies of non-motile cells 

 embedded in a copious mucilage, or attached in cylindrical, gela- 

 nous tubes. Like the Tetrasporales in the Chlorophyta, members of 

 this order are able to resume a motile condition directly. Zoospores 

 produced by these forms lose their motility and enlarge to form 

 adult plants. Cells are ovate or globose and contain 2 or more 

 yelldw-green, plate-like chromatophores from which fats and leucosin 

 accumulate as food reserves. One family is represented in our 

 collections. 



FAMILY MISCHOCOCCACEAE 



Cells in this family are arranged in gelatinous tubes. Repeated 

 cell division and subsequent tube formation result in dichotomous 

 or tetrachotomous dendroid colonies. The tubes are formed by the 



t 346 ] 



