106 



Chlorophycece 



Fig. 41. Pithophora (Edogonia Wittr. var. 

 pohjitpora Rendle and West f., from the Eeddish 

 Canal, near Manchester, A, x 65 ; B D, frag- 

 ments of thallus with asexual resting spores (as), 

 xlOO. 



ditches. Brand 1 states that 

 all the European species of 

 Cladophora described by Ra- 

 benhorst, except the JSgagro- 

 pilse, must be regarded as 

 varieties, forms, or conditions 

 of (.7. fracta or CL glume- 

 rata. 



Genus Chsetonella 

 Schmidle, 1901-. This 

 genus was instituted 

 for the reception of a 

 small, almost microscopic 

 plant, which occurs either 

 free-floating or attached 

 to the mucous coat of 

 other larger Algae. It is 

 incompletely septate, and 

 each segment possesses 

 from two to five nuclei. 

 The segments are cylin- 

 drical or more or less ir- 

 regular, and the thallus is 

 branched. The branches 

 are attenuated and the 

 terminal cells are of 

 greater length than the 

 others. There is one 

 parietal chloroplast with- 

 out pyrenoids. 



There is only one species, 

 Ch. Goetzei Schmidle, which is 

 known from tropical Africa 

 and from West Yorkshire. 

 The filaments are 6 8 p in 

 thickness. 



Family 2. PITHOPHORACE.EJ. 



The plants of this family very much resemble species of the 

 genus Cladophora. The thallus is of exactly the same type and the 



1 Brand in Bot. Centralbl. Ixxix, 1899. 



2 Schmidle in Engler's Botan. Jahrbiich. Bd 30, Heft 2, 1901, p. 253, t. v, 

 f. 1, 2. 





