APPENDIX 



275 



and colourless tracts, which are apparently differently distributed in the two 

 species. The colour varies from grass-green to olive-green, yellow, and 

 brown, and is dependent on the presence, in varying proportions, of 

 chlorophyll and of a yellow-brown colouring matter (? diatomin). They 



aft 



PIG. 1. 



Chlamydomyxa labyrinthuloides. a and 6, cysts from leaf-cells of Sphagnum, constricted by 

 the characteristic annular bands of the latter, from stained preparations showing the chromato- 

 phores and nuclei, x 620. c, end of a living cyst, treated with weak methylene blue solution. 

 The chromatophores are shaded. The nuclei are not seen, x 5000. d, nuclei highly magnified ; 

 c, /, living chromatophores ; g, chromatophore after treatment with Flemming's fluid and 

 fuchsin ; h, oat-shaped corpuscles ; e-h x about 10,000. (After Hieronymus.) 



appear to multiply by binary fission (Fig. I,/). The absence of a cellulose 

 envelope and of a nucleus, as well as other characters of the chromatophores, 

 prevent their being regarded as symbiotic algae. As a degeneration 

 product, and especially under the influence of bright sunlight, the 

 colouring matter breaks down, producing a red or brown fatty substance 

 ^lipochrome) which accumulates in drops in the interior of the cysts, and, 



