THE GREEN AI.GAE OF NORTH AMERICA 77 . 



COCCOMYXA Schmidle, 1901, p. 20. 



Cells enclosed in a general gelatinous mass, homogeneous or 

 sometimes showing slight stratification around the cells. Cells ' 

 usually elongate, with lateral, parietal chromatophore without 

 pyrenoid ; asexual reproduction by autospores, 4 in a cell. 

 Only one American species recorded. 



C. DISPAR Schmidle, 1901, p. 23, PI. I, figs. 6-25. Gelati- 

 nous mass attached, not floating, usually small but sometimes up 

 to several cm. diam. Cells ellipsoid, more or less unsymmetri- 

 cal, 4-8 /A diam., 2-2.5 diam. long. In moist places, on wood, 

 moss, etc. Fig. 26. Chocorua, N. H., W. G. Farlow. Europe. 



Common mode of reproduction by an oblique wall, but this 

 may be merely incomplete autospore formation. 



Page 311, for Key to the Species of Herposteiron, substitute, 



i. Cells usually subglobose, 5-15 M diam. 2. 



i. Cells usually elongate, 4-6 fj. diam. 2. H. vermiculoides. 



2. Cells 5-10 fj. diam., each usually with one seta. i. H. confervicola. 



2. Cells 9-12 judiam., each usually with several setae. 



3. H. polychaete. 



Page 312, after description of H. VERMICULOIDES, add, 



3. H. POLYCHAETE Hansgirg, i888b, p. 214, PI. XIV, figs. 



1-5. Cells subspherical, 9-12/1 diam., each bearing 2-6 setae 



with sharply bulbous base, and tapering gradually to a very fine 



point. Wis., G. M. Smith. Europe. 



Page 315, after paragraph on COLEOCHAETE, add, 

 C. DECORANS Richter, 1897, p. 9. fig. 4, and C. IKERASA- 

 CENSIS Richter, 1897, p. 10, fig. 5, are described as growing on 

 Oedogonium from Greenland. No reproduction of any kind is 

 known, and habit characters are not such as to make certain 

 that they belong to this genus. 



Page 323, for Key to the Species of Chaetomorpha, substitute, 



i. Filaments 400 /* diam. or more. 



i. Filaments less than 400 M diam. 6. 



2. Filaments increasing noticeably in diam. from the base up. 



i. C. clavata. 



2. Filaments of nearly uniform diam. .except at the extreme base. 3. 

 3. Basal cell several times longer than any other cell. 3. C. media. 

 3. Basal cell not markedly longer than the others. 4. 



4. Filaments more or less moniliform, usually closely curled. 



i A. C. tort a. 



4. Filaments not distinctly moniliform nor regularly curled. 5. 



