6 TUFTS COLLEGE STUDIES, VOL. IV, No. 7 



i- 1 2, is not, as he supposed, Charm inm minuium A. Braun, but 

 a then undescribed species, now Characiopsis Borziana Lemmer- 

 mann, 1914, p. 256. 



8. C. SUBULATA (A. Br.) Borzi, 1894, p. 152 ; Collins, 1909, 

 p. 100; Leuimermann, 1914, p. 258, fig. 3; P. B.-A., No. 1370; 

 Characium subulatum A. Brauii, 1855, p. 41, PI. V. C. Cell of 

 oblique lanceolate or falcate outline, gradually attenuate from 

 near the base to the acute apex, shortly attenuate to the very 

 short, capitate stipe, 10-20 X 4-6 /t ; chromatophore single ; 

 zoospores 2-4. Cal. Europe. 



P. B.-A., No. 1370, contains, along with this species, some 

 C. minuta (A. Br.) Borzi. 



9. C. LONGIPES (Rab.) Borzi, 1894, p. 152; Lemmermann, 

 1914, p. 259; Characium longipes Rabenhorst, Dec. 18, No. 171, 

 1852 ; in A. Braun, 1855, p. 42, PI. V. D. Cell suberect or 

 inclined, narrowly or broadly lanceolate, ending in a somewhat 

 oblique apiculum ; stipe from half to twice as long as the cell, 

 with basal disk. Wis., G. M. Smith. Europe. 



PERONIKLLA Gobi, 1887, p. 244. 



Cell ovoid, pyriform or subglobose at maturity, living in the 

 gelatinous coating of filamentous desmids, attached to the cells 

 by a slender stipe with basal disk. Asexual reproduction by 

 (uniciliate ?) zoospores. 



P. PLANCTONICA G. M. Smith, 1916, p. 476, PI. XXV, fig. 

 15. Cells ovoid-pyriform, 6-9.5 /* l n g stipe '8-10 ^ long, zoos- 

 pores 2-4 in a cell. In coating of Sphaerozosma. Fig. i. 

 Wis., G. M. Smith. 



P. Hyalothccae Gobi, inhabiting Hyalothcca mucosa in Europe, 

 is to be looked for on the same host here. It is somewhat 

 larger, 7-10 /* diatn., stipe 13-15 / long, and has usually 8 

 zoospores in a cell. 



MISCHOCOCCUS Nageli, 1849, p. 82. 



Cells globular, united by thick tubular gelatinous sheaths to 

 form branched colonies; cells only at ends of sheaths; each 

 cell with 1-4 chromatophores ; sexual reproduction by isogam- 

 ous gametes, the zygospore dividing to form an epiphytic 

 cushion ; asexual reproduction by zoospores germinating 

 directly. Only one species. 



M. CONFBRVICOLA Njigeli, 1849, p. 82, PI. II. D. Cells 

 3.5-5.5 M diam. Fig. 2. Wis., G. M. Smith. Europe. 



