2. Cells ovoid, or subglobose, without an apiculation 



but with a neck-like extension 3 



3. Stipe slender and hair-hke 4 



3. Stipe not slender and hair-like but broad, formed 



by the narrowing of the lorica , S. crassistipatus 



4. Stipe as long as the cell body, or longer S. capense 



4. Stipe shorter than the cell body S. vasiformis 



Stipitococcus apiculatus Prescott 1944, p. 361 

 PL 93, Figs. 11-13 



Cells ovoid or fusiform, apiculate, with a slender attaching stipe; 

 chromatophores 1-3; an oil (?) body near the anterior end, where 

 a rhizoidal thread extends; cells gregarious, attached in whorls about 

 filamentous desmids, sometimes 2 or 3 cells in a series on 1 stalk, 

 the protoplasts connected by rhizoidal threads; cells 3.8-4/a in 

 diameter, 18-36|it long, including the stipe. 



The arrangement of the cells in dense, transverse zones about the 

 host filament gives a very distinctive appearance to this species. The 

 occurrence of 2 or 3 cells in a linear series on a single attaching stipe 

 is unlike any of the other described forms. It is thought that this 

 condition must be the result of in situ germination of swarmers. 



On Hijalotheca filaments. Wis. 



Stipitococcus capense Prescott in Prescott & Croasdale 1937, p. 271 



PI. 93, Figs. 14, 15 



Lorica flask-shaped on a long slender stipe, narrowed anteriorly 

 into a short, straight neck with parallel margins; chromatophores 

 1-2; cells 6-11.7^ in diameter, 22-23.4;it long. 



This form is suggestive of a Lagijnion on a stipe. The chromato- 

 phores are more definite in shape and more richly colored than in 

 that genus. It should be noted in Pascher's Heterokonten (Raben- 

 horst's Kryptogamen-Flora, 11, p. 1062, 1939) that incorrect refe- 

 rence is made to the figures illustrating S. capense and S. vasiformis, 

 both the figure descriptions and the text references being reversed. 



On filamentous algae in Sphagnum bogs. Mich., Wis. 



Stipitococcus crassistipatus Prescott 1944, p. 362 

 PI. 93, Figs. 16-19 

 Lorica broadly (sometimes narrowly) flask-shaped, attenuated 

 anteriorly to form a short wide neck and reduced posteriorly into 

 a thick stipe which is 1.5-2/x wide; protoplast ovoid to subglobose, 

 with 2 laminate chromatophores; lorica 7.6-8/i, in diameter, 18-20^ 

 long. 



[345] 



