54 COCCOFHYCE^E. 



The foregoing life-history is somewhat abridged from the account 

 given by Braun (" Rejuvenescence," pp. 206-214), and for farther de- 

 tails the reader is referred to the Memoir by Flotow (" Nova Acta 

 Natura Curiosorum," Vol. xx. p. 11), and that by Cohn (translated in 

 " Memoirs " by the Eay Society, 1853), which will furnish all that can 

 be required, and are really exhaustive. For remarks on an Amoeboid 

 condition see paper by T. Charters White in the " Journal of the 

 Quekett Microscopical Club " for 1879. 



Plate XXL Jiff. I. a, still cells X 400; b, green cell with chloro- 

 phyll vesicle, and reddish nucleus ; c,, a cell which had been dried six 

 years, undergoing segmentation after revival ; d, completed division ; 

 e, division into four ; /, naked green zoospore ; g, encysted zoospore ; 

 h, primordial cell, commencing division in two ; i, encysted zoospore, 

 which has deliquesced ; j, primordial cell dividing in four ; k, encysted 

 zoospore in still condition ; I, division of scill cell into 8 cylindrical 

 zoospores ; m, escaped zoospore ; n, division of encysted cell into 4 ; 

 o } division into 8 ; p, division into 32 ; q, zoospores from the latter form 

 escaped from mother-cell ; r, large red still cell dividing into segments ; 

 s, red encysted cell ; t, yellow-green still cell. All after Cohu. 



Chlamydococcus nivalis. Br. Rejuv.p. 206. 



Cells globose, red, at first with a hyaline border, which is the 

 thickened epispore, which gradually disappears with age. 



SIZE. Cells 'Ol-'OS mm. diam. 



Rab. Alg. Eur. Hi. 93. 



Hcrmatococcus nivalis, Ag. Icon. Alg. t. 31. 



Protococcus nivalis, Ag. Supp. p. 13. Hook. Eng. Fl. v. 

 p. 395. Mackay Hibern. p. 246. Hass. Alg. p. 335, t. 83, f. 2. 

 Harv. Man. p. 182. Grev. Sc. Crypt. Fl. t. 231. 



Palmella nivalis, Hook, in Parry's Voy. App. p. 328. 



Tremella nivalis, Brown, in Ross Voy. Supp. p. 44. 



Uredo nivalis, Bauer. Journ. Sci. and Art vii. p. 222, t. 6. 



On snow and wet rocks, &c. 



Probably not specifically distinct from Chlamydococcus pluvialis. For 

 the history of this minute plant, long known as " Red Snow," consult 

 " Greville's Scottish Cryptogamic Flora," Vol. iv. plate 231. The inter- 

 esting observations by Agardh and others, there detailed, are too long 

 for quotation here. 



Introduced to the notice of botanists in this country on the return of 

 Capt. Ross from Baffin's Bay, where it was found extending for some 

 miles, it was regarded by Bauer as a fungus, by Robert Brown as an 

 Alga, and by Baron Wrangel as a Lichen. Agardh first included it in 

 Algae, under the name of Protococcus nivalis. 



It has been found in this country " on the borders of the lakes of 

 Lismore, spreading abundantly over the decayed reeds, leaves, &c., at 

 the water's edge, but in greater perfection on the calcareous rocks within 

 the reach of occasional inundation, more or less perfect at all seasons of 

 the year." Carm. Also in Ireland. 



Plate XXI. ffj. 2. a, still cells X 400 ; b, cell divided in two ; c, cell 

 divided in four ; d, advanced stage of subdivision in four ; e, encysted 

 zoospore ; /, free zoospore ; ff, resting cell. 



