Tribonemacece 



2f>7 



Linnajus, and certainly none of them were distinguished by him from other 

 simple filamentous forms. 



"For Lagerheim's group of species, as for all genera, the adoption of a 

 generic name based on a recognizable species, as a type, is essential. The 



Fig. 121. A G, Tribonema bombycinum (Ag.) Derb. & Sol.; A, from Shipley, 

 W. Yorks. ; B, showing aplanospores (ap), from Senens, Cornwall; C, zoogo- 

 nidium, and D F, young plants, from Senens, Cornwall (all x 450) ; G, after 

 treatment with potassium hydrate (after Bohlin, x 570). H and I, T. bomby- 

 cinum forma minor (Wille) nob.; H, from Shipley, W. Yorks.; I, showing 

 aplanospores (ap), from near St Just, Cornwall (x450). J, Bumilleria pumila 

 W. & G. S. West, from near Senens, Cornwall ( x 450). 



earliest such name in the present case is Tribonema Derbes & Solier (1856) 1 . 

 This genus was based on a single species, Conferva bombycina, and in the 

 diagnosis, for the first time in the history of the species, explicit mention was 

 made of the most essential character, namel}-, the form of the chromatophores, 

 although it had been previously suggested in the plates of Kiitzing. The 

 method of zoospore dispersal was also first described and illustrated by Derbes 

 & Solier. There is, then, every reason for employing the name Tribonema as 

 a memorial of the discernment of these authors." 



1 Derbes & Solier, Me"m. sur quelques points de la physiologic des Algues, 1856. 

 W. A. 17 



