SPIROGYRA 199 



found the earlier stages of conjugation. It is therefore easy to understand 

 why Professor Ivey Lewis proposed a new genus for this species and gave it 

 the name Temnogyra. The species is named in honor of Frank S. CoUins 

 of Maiden, Massachusetts, who published The Green Algae of North 

 America in 1909 and numerous other papers on fresh-water and marine 

 algae. 



184. Spirogyra punctata Cleve 1868. Nova Acta Reg. Soc. Sci. 



Upsali. Ser. 3, 6, p. 23, PL 4, Figs. 1-4. 



Vegetative cells 24-30 yu, x 70-360 jti, with plane end walls; i chro- 

 matophore, making 3 to 8 turns in the cell; conjugation lateral and 

 scalariform; tubes formed by the male gametangia; gametangia single, 

 or in pairs, separated by much longer sterile cells in each filament; fer- 

 tile gametangia inflated to 45 /u.; zygospores ellipsoid, 28-43 /a x 42-78 m; 

 median spore wall coarsely punctate, yellow. (PL XXXIV, Fig. i.) 



United States: Iowa to Massachusetts and New Jersey. 



Reported from Europe, Afghanistan, China, and Australia. 



Some of the older records would now be changed to other species of the 

 "punctata group" since they were probably made on the basis of the tubes 

 and of the contrast between gametangia and sterile cells. The species 

 described by Jao as S. collinsii var. ampla {Trans. Amer. Micros. Soc, 54, 

 p. 2. 1935) seems to belong here, and I have used his drawing to illustrate 

 this species. 



185. Spirogyra sirogonioides Hughes 1943. Abstracts of Doctoral 



Dissertations. The Ohio State University, 40, 1943. 



Vegetative cells 17-22 /^ x (60-) 160-220^1 with plane end walls; i 

 chromatophore, making 3 to 6 turns in the cell; conjugation lateral and 

 scalariform; tubes formed mostly by the male gametangia, sometimes 

 becoming very broad at maturity; receptive gametangia inflated on the 

 conjugating side; zygospores ellipsoid, 35-39 /^ x 58-67 /a; median wall 

 yellow-brown, ornamented with variably shaped and irregularly dis- 

 tributed scrobiculae. (PL XXXIII, Figs. 7-8.) 



Canada, Charleston, Queens County, Nova Scotia, July, 1941, and 1942. 



The specific name was suggested by the fact that occasional mature 

 pairs of gametangia have the appearance of conjugated cells in Sirogonium. 



186. Spirogyra lushanensis Li 1938. Bull. Fan Mem. Inst. Biol. 



8, p. 92, PL 2, Figs. 4-5. 



Vegetative cells 17-23/^ x 84-1 58 ft, with plane end walls; i chro- 

 matophore, making 3.5 to 7 turns in the cell; conjugation scalariform; 

 tubes formed wholly by the male gametangia; fertile cells inflated to 

 38 ft and shortened; zygospores ellipsoid, 26-36^1 x 42-78 /x; median wall 

 irregularly reticulate, yellow. (PL XXXIII, Fig. 6.) 



China, Kiangsi, Lushan, September, 1936. 



