204 CYSTIPHOR.E. 



Chroococcus cohaerens. Nag. fide RaWi. 



Cells oblong, twin, or in fours, with a distinct hyaline ellipsoid 

 tegument ; cell-membrane thin, achromatic ; cell-contents 

 homogenous, or slightly turbid, blue-green. 



SIZE. Cells -003-'006 mm. diam. Families of 2-4 indivi- 

 duals. 



Rabh. Alg. Eur. ii., 30. Kirch. Alg. Schles. 261. 



Protococcus cohcerens, Kutz. Spec. 197. Tab. Phyc. 1, t. 5. 



Pleurococcus cohcerens, Breb. in Meneg. Nost. Ital. 35, t. iv., 

 f. 3. 



On damp walls and flower pots. 



Plate LXXXI1I. fig. 1. Cells magnified 400 diam. 



Chroococcus turgidus. Nag. Einz. Alg. 2^ 46. 



Cells spherical, oblong-ellipsoid, or more or less angular from 

 compression, single, twin, ternate, or quaternate (rarely 8), 

 associated in families, tegument thick, usually evidently lamel- 

 lose, colourless. Cell-membrane thin ; cell contents bright 

 verdigris green and homogenous, at length becoming brownish 

 and granulated. 



SIZE. Cells -013--025 mm. diam. Families of 2-4. 



Rabh. Alg. Eur. ii., 32. Kirch. Alg. Schles. p. 262. 



Protococcus turgidus, Kutz. Tab. i., t. 6, f. 1. 



Hcematococcus binalis, Hass. Alg. p. 331, t. 82, f. 2. 



In swampy places and on moist rocks. 



Not at all uncommon ; often mixed with other algee. Easily dis- 

 tinguished by its size. 



Plate LXXXIII. jftff. 2. Cells magnified 400 diam. 



GENUS 82. GLCEOCAPSA. Kutz. (1843.) 



Cells spherical, either single or numbers, associated in 

 families, the single cell included in a vesiculiform tegument, 

 this cell undergoing division into two daughter cells. Each 

 has a distinct tegument, the whole being surrounded by the 

 tegument of the mother cell. This process is repeated again 

 and again, the original tegument remaining and surrounding 

 the family thus formed. Cell membrane thick, often very thick, 

 equalling or exceeding in diameter the cavity of the cell; 

 colourless or coloured, mostly lamellated, strata not tin- 

 frequently separating. Cell contents of various colours, 



