140 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



Forma UNIFORMIS Collins, P. B.-A., No. 1265. Forming 

 rounded, gelatinous masses not over 3 cm. diam.; cells 6-8 /x 

 diam., varying but little in size. Cal. 



5. APIOCYSTIS Nageli in Kiitzing, 1849, p. 208. 

 Colony microscopic, vesicular, attached by a stipe-like base, 

 containing more or less numerous cells, scattered or arranged in 

 circles, the thick wall diffluent into the general gelatinous mass 

 of the colony ; chromatophore nearly covering the cell wall, with 

 one pyreuoid ; cells dividing in all directions. Asexual repro- 

 duction by cells becoming biciliate as in Tetraspora ; sexual 

 reproduction by the union of smaller, biciliate gametes. 



A. BRAUNIANA Nageli, 1848, p. 67, PI. II. A, fig. i ; Wolle, 

 1887, p. 202, PI. CXXIII, figs. 6-10 ; Wittr. and Nordst., Alg. 

 Exsicc., No. 356. Colony pyriform, pale green, 20-100/1. diam., 

 about twice as long ; containing usually 8-32, rarely up to 300 

 globose cells, 6-8 /x diam. Growing on various algae in ponds 

 and ditches.* Fig. 27. Maine, Mass., Fla. 



Eiiropc, New Zealand. 



6. PALMODACTYLON Nageli in Kiitzing, 1849, p. 234. 

 Colonies microscopic, unattached, in the form of elongate sacs, 

 simple or branched, often radiating from a common center ; con- 

 taining globose, thick-walled cells. Asexual reproduction as 

 in Palmella. 



P. VARIUM Nageli, 1848, p. 70, PI. II. B, fig. i ; Wolle, 1887, 

 p. 189, PI. CXXIV, figs. 8 and 9. P. simplex Nageli, 1848, p. 

 70, PI. II. B, fig. 2 ; Wolle, 1887, p. 189. Colonies composed of 

 many simple or branched, more or less radiately arranged sacs, 

 up to 50 /A diam. by 280 p. long ; cells at first in 4-8 longitud- 

 inal series, later crowded and without order, 4-7 p. diam. Fig. 

 28. Maine. Eiirope. 



P. simplex appears to be merely a young or undeveloped 

 state. " In stagnant fresh water" according to Wolle, but no 

 definite locality given. 



Rabenhorst, all, as far as seen, appear to be young stages of T. lubrica 

 or T. gelatinosa. The plants distributed as P. B.-A., No. 64, and in Til- 

 den, Ainer. Algae, No. 47, seem to correspond with T. gelatinosa forma 

 b. of Rabenhorst, 1868, p. 40. 



T. macrospora F. L. Harvey, 1892, p. 119, PI. CXXVI, figs. 1-6, should 

 probably be included under T. gelatinosa. 



* A. elongata F. L. Harvey, 1892, p. 120, Pi. CXXVI, figs. 6-1 1, from 

 Maine, differs from the type only in the more elongate form of the colony, 

 and the slightly larger cells; but A. Brauniana varies enough to in- 

 clude the form and sizes given for A. elongata. 



