64 



Chlorophycece 



hosts for various epiphytes, but they do not feel so slimy as most 

 filamentous green Algse. 



There are about 80 British species of this genus, exhibiting great variation 

 in size and in the relative proportions of the cells. They are exceedingly 

 abundant, particularly in quiet waters, and with one or two exceptions the 

 species can only be accurately identified from fructiferous specimens. They 

 are frequently found in the fructiferous condition in suitable localities, such 

 as small ponds and ditches, and more commonly in the south of England and 

 south-west of Ireland than in other parts of the British Islands. The smallest 

 British species is CE. tapeinosporum Wittr. (diam. of vegetative cells 2 '7 5/i), 

 and the largest is CE. giganteum Kiitz. (diam. of vegetative cells 30 50 /x). 

 (E. undulatum (Breb.) A. Br. (fig. 14 A) possesses very characteristic undulate 



Fig. 15. A, Bulbochcete subintermedia Elfv., from near Senens, Cornwall. B, B. 

 Nordstedtii Wittr., from near Glendoan, Donegal, Ireland. C, B. nana 

 Wittr., from Goring, Oxfordshire (x495). a, antheridium; and, androspo- 

 rangium ; n, nannandrium; oo, oogonium. 



