i 6 ^ COCCOPHYCE^E. 



** Species red or brownish. 

 Pleurococcus miniatus. (.Kutz) Nag. Einz. Alg. p. 65. 



Cells very variable in size, globose, usually single, rarely 2-4 

 in a family, seated on a broadly effused red stratum, which is 

 more or less gelatinous. Cell-membrane rather thick, colour- 

 less, hyaline, contents oleaginous orange. 



SIZE. Cells -0037--016 mm. (Kabh.), -0035--015 mm. (Kirch.}. 



Rabh. Alg. iii. p. 27. Rabh. Exs. 31, 368, 1777. Kirch. 

 Alg. Schl. p. 115. 



On the walls of conservatories, all the year. 



This is one of the species in which Braun has observed the " skinning 

 off " of the outer cell-membrane. 



Nageli ascribes the red colour occurring in many Palmellacece, partly 

 as a normal, partly as an abnormal phenomenon, to the formation of an 

 orange-coloured oil in the place of the chlorophyll.* Braun says that 

 probably all these have the power of retaining their life a long time in 

 the dried condition ; in the above species at least, he is quite sure of it. 

 The brownish-red colour often acquired by Protococcus viridis may pro- 

 bably be explained in the same way.f 



Plate II. jig. 5. Cells magnified 400 diam. 



Pleurococcus roseo-persicinus. Rabh. Alg. in., 28. 



Aquatic. Cells unequal, cloudy, single or binate, tegument 

 hyaline, collected on a thin, rather gelatinous peach-rose coloured 

 stratum. 



SIZE. Cells -0015--004 mm. 



Protococcus roeeo-persicinus, Kutz. Tab. i. t. i. 



Clathrocystis roseo-persicinus, Conn, Beitr. iii. (1875), t. 6, 

 f. 1-10. 



Investing submerged aquatic plants. 



This very minute species, with cells of a peach colour, is not un- 

 common about the debris of decaying plants in pools. The cells are 

 usually agglomerated in spherical or elliptical masses. Certainly not a 

 good Pleurococcus. 



Plate II. Jig. 6. Cells magnified 400 diam. 



GENUS 3. GL-2EOCYSTIS. Nag. (1849.) 

 Cells globose or oblong, either single or 2-4-8, associated in 

 globose families. Common and special integuments gelatinous, 

 lamellose. Division in alternate directions. Propagation by 



zoogonidia. 



The lamellose tegument distinguishes the species of this genus from 

 Pleurococcus. Its analogue in the Phycochromacefe is Glceocapsa. 



* More or less green. 

 Glaeocystis amp la. Kutz. 



Thallus gelatinous, rounded, lobed, dirty green. Cells glo- 

 bose, or rounded oblong, 2-4-6 (rarely 8), associated in fami- 

 lies ; tegument colourless, gelatinous, distinctly concentrically 

 stratose. Contents green, granular. 



* Einzelliger Algae, p. 9. f " Eejuvenescence," p. 213, note. 



