30 COCCOPHYCE.E. 



Sub-Family 2. CHLOEOCOCCACE^I. 



Cells spheroid, either single and free, furnished with a 

 chlorophyllose vesicle and a pale lateral spot, sometimes with an 

 ample tegument, or more often accumulated in strata or little 

 clusters. Propagation by zoospores, formed by division of the 

 cell contents, escaping by rupture of the cell wall. 



GENUS 23. CHLOROCOCCUM. Fries. (1825.) 

 Cells subglobose, single or in clusters. Characters the same 

 as the sub-family. 



A. Species green. 

 f Tegument thin. 



Chloxococcum humicolum. (Nag.} Rabh. Kr. Fl. Sachs, 137. 

 Stratum effused, dark-green, pulverulent ; cells globose, 

 variable in size, often many united in families, involved in a 

 common hyaline tegument ; cell membrane thin, but thickening 

 with age ; contents at first pale or yellowish-green, homo- 

 genous, at length dark-green, granular. 

 SIZE. Cells -017 mm. diam., or less. 

 Rabh. Alg. iii. 58. 

 Cystococcus humicola. Nag. Einz. Alg. 85, t. 3, f. E. 



On the naked ground (A. W. Wills}. 

 Plate X21. fog. 5. Cells and family magnified 400 diameters. 



Chloxococcum frustulosum. (Carm.) Eabli. Alg. m., 59. 



Thallus effused, pulverulent, green ; cells globose, of medium 

 size, associated in families which are involved in a broad hyaline 

 homogenous envelope. 



SIZE. Cells -007 mm. diam. ; families to "04 mm. diam. 



Hcemato coccus fmstulosus^ Hass. Alg. 380, t. 81, f. 1. Eng. 

 Fl. v., p. 395. Harv. Man. 181. 



PalmeHa frustulosa, Carm. MSS. 



On moist rocks. 



" It occurs in the form of a greyish black, fragmentary scurf. On the 

 slightest pressure it separates into corpuscles of various forms, bat 

 mostly sphoerical, hyaline under the microscope, surrounded by a mem- 

 branous envelope, and including several granules.'' Carm. 



Plate XII. fig. 2. Families magnified 400 diameters. 



Chlorococcum muxoxum. (Grev.} Rabh. Alg. in., 61. 



Thallus crustaceous, yellowish-green ; cells subglobose or 

 oblong, with a rather thick hyaline mucous envelope ; cell con- 

 tents seruginous-green, homogenous. 



SIZE. Cells, including envelope, -016--02 x '01 mm. 



Grev. Sc. Crypt. Fl., t. 325. 



Hcematococcus murorum, Hass. 323, t. 81, f. 4. 



On walls. 



