30 COCCOPHYCE. 
Sub-Family 2. CHLOROCOCCACER. 
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. 
Tt Tegument thin. 
Chlorococcum humicolum. (Ndg.) 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. Hinz. Alg. 85, t. 3, f. E. 
On the naked ground (A. W. Wills). 
Plate X1J. fig. 5. Cells and family magnified 400 diameters. 
Chlorococcum frustulosum. (Carm.) Rabh. Alg. 111., 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. 
Hematococcus frustulosus, Hass, Alg. 380, t. 81, f.1. Eng. 
Fl. v., p. 395. Harv. Man. 181. 
Palmella frustulosa, Carm, MSS. 
On moist rocks. 
“Tt occurs in the form of a greyish black, fragmentary scurf. On the 
slightest pressure it separates into corpuscles of various forms, but 
mostly sphzerical, hyaline under the microscope, surrounded by 2 mem- 
branous envelope, and including several granules.”—Carm. 
Plate XII. fig. 2. Families magnified 400 diameters. 
Chlorococcum murorum. (Grev.) Rabh. Alg. ur., 61. 
Thallus crustaceous, yellowish-green; cells subglobose or 
oblong, with a rather thick hyaline mucous envelope; cell con- 
tents eruginous-green, homogenous. 
Sizz. Cells, including envelope, ‘016--02 x :01 mm. 
Grev. Se. Crypt. FL, t. 325. 
Hematococcus murorum, Hass, 323, t. 81, f. 4. 
On walls. 
